Use a common format for all include guards, make sure each header file
has one and make sure it's named after the file name.
And as a random extra in this commit: Make sure the gen_version.h file
generated by cmake ends with a line break.
Closes#59.
Call saveAll() in the VacuumDialog to make sure to release all savepoints.
Also cancel the dialog when no object was select but the OK button
clicked. This avoids an unnecessary DB reload in the main window.
Add a new dialog which is shown when compacting the database. This
dialog allows selecting single objects individually to avoid vacuuming
the entire database.
It also shows a new warning if the database is dirty as changes are
going to be saved before vacuuming.
Martin Kleusberg