[commhistory-daemon] Undo package and file renaming in Qt5 port

There is no need for commhistory-daemon to be co-installed (which was
slightly broken, anyway), or even for it to build against Qt4 anymore.
Renaming the package and files will only cause trouble.

This can be done without obsoleting the qt5 package, because that was
never tagged and built anywhere.
Merge pull request #9 from special/master

[commhistory-daemon] Undo package and file renaming in Qt5 port