fixes some more problems on copy-and-paste

In the HTML version of this document, some characters in the listings
have been transformed to look better (ligatures like 'fi' or 'fl' into a
single character 'fi').
However, these characters did cause problems when using copy-and-paste.

As the documented ways did not work to disable this behavior, we have to
manually create a list of characters, that should not be transformed.

We added a set of ligatures that should not be transformed.
We hope, we have now covered all character groups that could cause
problems.

manuals/en/main/bareos.sty

@@ -682,7 +682,20 @@ Version $>=$ #3%
         basicstyle=\ttfamily,
         columns=fullflexible,
         keepspaces=true,
-        literate={-}{-}1,
+        literate={-}{-}1
+                 {ch}{c{}h}2
+                 {ck}{c{}k}2
+                 {fb}{f{}b}2
+                 {ff}{f{}f}2
+                 {fh}{f{}h}2
+                 {fi}{f{}i}2
+                 {fj}{f{}j}2
+                 {fl}{f{}l}2
+                 {fk}{f{}k}2
+                 {ll}{l{}l}2
+                 {th}{t{}h}2
+                 {tt}{t{}t}2
+                 ,
         caption=\mbox{#1},
         captionpos=b,
         % command only work for single commands without parameter.