Add a Txt2tags test case

From the official docs:
https://txt2tags.googlecode.com/svn/trunk/samples/sample.t2t

tests/ctags/Makefile.am

@@ -216,6 +216,7 @@ test_sources = \
 	refcurs.sql						\
 	regexp.js						\
 	rules.t2t						\
+	sample.t2t						\
 	secondary_fcn_name.js			\
 	semicolon.f90					\
 	shebang.js						\

tests/ctags/sample.t2t

@@ -0,0 +1,225 @@
+TXT2TAGS SAMPLE
+Aurelio Jargas
+%%mtime(%m/%d/%Y)
+
+%!encoding: UTF-8
+
+This text is before the introduction.
+
+But it's OK.
+
+                  =  Introduction  =
+
+Welcome to the txt2tags sample file.
+
+Here you have examples and a brief explanation of all
+marks.
+
+The first 3 lines of this file are used as headers,
+on the following format:
+```
+line1: document title
+line2: author name, email
+line3: date, version
+```
+
+Lines with balanced equal signs = around are titles.
+
+% a secret comment!
+%TODO link to program site http://txt2tags.org
+
+
+              =  Fonts and Beautifiers  =
+
+We have two sets of fonts:
+
+The NORMAL type that can be improved with beautifiers.
+
+The TYPEWRITER type that uses monospaced font for
+pre-formatted text.
+
+We will now enter on a subtitle...
+
+
+                  ==  Beautifiers  ==
+
+The text marks for beautifiers are simple, just as you
+type on a plain text email message.
+
+We use double *, /, - and _ to represent **bold**,
+//italic//, --strike-- and __underline__.
+
+The **//bold italic//** style is also supported as a
+combination.
+
+
+              ==  Pre-Formatted Text  ==
+
+We can put a code sample or other pre-formatted text:
+```
+  here    is     pre-formatted
+//marks// are  **not**  ``interpreted``
+```
+
+And also, it's easy to put a one line pre-formatted
+text:
+``` prompt$ ls /etc
+
+Or use ``pre-formatted`` inside sentences.
+
+
+                ==  More Cosmetics  ==
+
+Special entities like email (duh@somewhere.com) and
+URL (http://www.duh.com) are detected automagically,
+as long as the horizontal line:
+
+--------------------------------------------------------
+^ thin or large v
+========================================================
+
+You can also specify an [explicit link http://duh.org]
+or an [explicit email duh@somewhere.com] with label.
+
+And remember,
+	A TAB in front of the line does a quotation.
+		More TABs, more depth (if allowed).
+Nice.
+
+
+                      =  Lists  =
+
+A list of items is natural, just putting a **dash** or
+a **plus** at the beginning of the line.
+
+
+                  ==  Plain List  ==
+
+The dash is the default list identifier. For sublists,
+just add **spaces** at the beginning of the line. More
+spaces, more sublists.
+
+- Earth
+  - America
+    - South America
+      - Brazil
+        - How deep can I go?
+  - Europe
+    - Lots of countries
+- Mars
+  - Who knows?
+
+
+The list ends with **two** consecutive blank lines.
+
+
+                 ==  Numbered List  ==
+
+The same rules as the plain list, just a different
+identifier (plus).
+
++ one
++ two
++ three
+  - mixed lists!
+  - what a mess
+    + counting again
+    + ...
++ four
+
+
+                ==  Definition List  ==
+
+The definition list identifier is a colon, followed by
+the term. The term contents is placed on the next line.
+
+: orange
+  a yellow fruit
+: apple
+  a green or red fruit
+: other fruits
+  - wee!
+  - mixing lists
+    + again!
+    + and again!
+
+
+                     =  Tables  =
+
+Use pipes to compose table rows and cells.
+Double pipe at the line beginning starts a heading row.
+Natural spaces specify each cell alignment.
+
+  | cell 1.1  |  cell 1.2   |   cell 1.3 |
+  | cell 2.1  |  cell 2.2   |   cell 2.3 |
+  | cell 3.1  |  cell 3.2   |   cell 3.3 |
+
+|| heading 1 |  heading 2  |  heading 3 |
+ | cell 1.1  |  cell 1.2   |   cell 1.3 |
+ | cell 2.1  |  cell 2.2   |   cell 2.3 |
+
+ |_ heading 1 |  cell 1.1   |   cell 1.2 |
+  | heading 2 |  cell 2.1   |   cell 2.2 |
+  | heading 3 |  cell 3.1   |   cell 3.2 |
+
+|/ heading   |  heading 1  |  heading 2 |
+ | heading 1 |  cell 1.1   |   cell 1.2 |
+ | heading 2 |  cell 2.1   |   cell 2.2 |
+
+Without the last pipe, no border:
+
+  | cell 1.1  |  cell 1.2   |   cell 1.3
+  | cell 2.1  |  cell 2.2   |   cell 2.3
+  | cell 3.1  |  cell 3.2   |   cell 3.3
+
+|| heading 1 |  heading 2  |  heading 3
+ | cell 1.1  |  cell 1.2   |   cell 1.3
+ | cell 2.1  |  cell 2.2   |   cell 2.3
+
+ |_ heading 1 |  cell 1.1   |   cell 1.2
+  | heading 2 |  cell 2.1   |   cell 2.2
+  | heading 3 |  cell 3.1   |   cell 3.2
+
+|/ heading   |  heading 1  |  heading 2
+ | heading 1 |  cell 1.1   |   cell 1.2
+ | heading 2 |  cell 2.1   |   cell 2.2
+
+                =  Special Entities  =
+
+Because things were too simple.
+
+
+                    ==  Images  ==
+
+The image mark is as simple as it can be: ``[filename]``.
+
+                      [img/photo.jpg]  
+
+And with some targets the image is linkable :
+
+                      [[img/photo.jpg] http://www.txt2tags.org]  
+
+- The filename must end in PNG, JPG, GIF, or similar.
+- No spaces inside the brackets!
+
+
+                     ==  Other  ==
+When the target needs, special chars like <, > and &
+are escaped.
+
+The handy ``%%date`` macro expands to the current date.
+
+So today is %%date on the ISO ``YYYYMMDD`` format.
+
+You can also specify the date format with the %? flags,
+as ``%%date(%m-%d-%Y)`` which gives: %%date(%m-%d-%Y).
+
+That's all for now.
+
+-------------------------------------------------------
+%%% TRANSLATOR: Uncomment and translate the next two lines
+%Translated by John Smith.
+%-------------------------------------------------------
+[img/t2tpowered.png] ([%%infile %%infile])
+
+% vim: tw=55

tests/ctags/sample.t2t.tags

@@ -0,0 +1,14 @@
+# format=tagmanager
+Beautifiers�64�Fonts and Beautifiers�0
+Definition List�64�Lists�0
+Fonts and Beautifiers�64�0
+Images�64�Special Entities�0
+Introduction�64�0
+Lists�64�0
+More Cosmetics�64�Fonts and Beautifiers�0
+Numbered List�64�Lists�0
+Other�64�Special Entities�0
+Plain List�64�Lists�0
+Pre-Formatted Text�64�Fonts and Beautifiers�0
+Special Entities�64�0
+Tables�64�0