* Merging upstream version 2.9.4+debian.
* Regenerating 03-disable-auto-update.patch.
* Removing 05-use-libsynctex.patch as TeXstudio includes a modified
  version of the synctex parser.
* Removing libsynctex-dev from Build-Depends as TeXstudio includes a
  modified version of the synctex parser.
* Removing 06-fix-silent-file-saving.patch, fixed upstream.
* Adding 05-fix-mercurial-revision.patch in order to prevent TeXstudio's
  mercurial revision from being empty.
* Updating year in copyright file.
* Updating quazip's copyright information.
* Rebuilding upstream tarball without:
  - conflicting debian directory
  - unused hunspell directory
  - unused include_win32 directory
  - unused include_win32_qt5 directory
  - unused qt translations
  - unused dictionary and thesaurus files
  - unused TexTablet directory
  - unused poppler-data directory