Bring most mimetypes in line with XDG specifications.  The following are not fully verified in source as of this commit due to ubiquity: html, empty, info, make, man, misc, source, unknown

diff --git a/pytdeextensions.desktop b/pytdeextensions.desktop
index cee05c2..10d0a28 100644
--- a/pytdeextensions.desktop
+++ b/pytdeextensions.desktop
@@ -2,7 +2,7 @@
 Name=Pytdeextensions
 Comment=Python bindings
 Terminal=false
-Icon=source_py
+Icon=text-x-text-x-src_py
 OnlyShowIn=TDE;
 X-DocPath=pytdeextensions/index.html
 Encoding=UTF-8