- Remove a cache file .qmake.stash, the presence of which causes
build failures on openSUSE Leap 15.1 and 15.0.
- Move appdata file to metainfo dir which is the standard now.

- Update to version 5.0.3:
* Fix bad highlighting on misspelled text before a \cite{} or
\label{} command.
* If no text is selected the "(un)comment" command will
(un)comment the current line.
* The default size of the configuration dialog has been reduced.
* Fold/Unfold/Fold All/Unfold All menu options has been added.
* Fix bug about completion when citing references that contain
numbers.
* Fix "recent files" menu with names including an ampersand.
* Fix typo in the documentation.
* Updated translations.