wmlindent: use print function instead of print statement

This solution has the advantage of fixing one of the most important issues when moving to Python 3.
Also, in other tools this will allow getting rid of the inconsistent usage of print>>sys.stderr/out and sys.stderr/out.write

data/tools/wmlindent

@@ -61,6 +61,8 @@ if there's an indent open at end of file or if a closer occurs with
 indent already zero; these two conditions strongly suggest unbalanced WML.
 """
 
+from __future__ import print_function
+
 import sys, os, getopt, filecmp, re
 from wesnoth import wmltools
 
@@ -119,12 +121,12 @@ def reindent(name, infp, outfp):
         if "wmlindent: opener" in line:
             tag = line.split('"')[1]
             if verbose and not quiet:
-                print >>sys.stderr, "wmlindent: declaring indent exception for %s" % tag
+                print("wmlindent: declaring indent exception for %s" % tag, file=sys.stderr)
             opener_prefixes.append(tag)
         elif "wmlindent: closer" in line:
             tag = line.split('"')[1]
             if verbose and not quiet:
-                print >>sys.stderr, "wmlindent: declaring outdent exception for %s" % tag
+                print("wmlindent: declaring outdent exception for %s" % tag, file=sys.stderr)
             closer_prefixes.append(tag)
         # Implement passthrough mode
         if "wmlindent: start ignoring" in line:
@@ -163,7 +165,7 @@ def reindent(name, infp, outfp):
         # one that started the block.
         if closer(transformed):
             if indent == "":
-                print >>sys.stderr, 'wmlindent: "%s", line %d: close tag %s with indent already zero.' % (name, countlines, transformed.strip())
+                print('wmlindent: "%s", line %d: close tag %s with indent already zero.' % (name, countlines, transformed.strip()), file=sys.stderr)
             else:
                 indent = indent[:-len(wmltools.baseindent)]
         # Cope with blank lines outside of multiline literals
@@ -213,7 +215,7 @@ def reindent(name, infp, outfp):
             lasttag = ""
     # Pure macro files look like they have unbalanced indents.  That's OK
     if indent != "" and seen_wml:
-        print >>sys.stderr, 'wmlindent: "%s". line %d: end of file with indent nonzero.' % (name, countlines)
+        print('wmlindent: "%s". line %d: end of file with indent nonzero.' % (name, countlines), file=sys.stderr)
 
 def allwmlfiles(dir):
     "Get names of all WML files under dir, or dir itself if not a directory."
@@ -279,7 +281,7 @@ if __name__ == '__main__':
     exclude = []
     for (opt, val) in options:
         if opt in ('-?', '-h', '--help'):
-            print __doc__
+            print(__doc__)
             sys.exit(0)
         elif opt in ('-d', '--dryrun'):
             dryrun = True