Change »Aliase« to »Aliasse«

Relabeled the »Aliase« tab in table view to »Aliasse«
Change form calculation method

In ListView, the form number (e.g. 8) is now extracted from the form (e.g. 8b)
using the method m_calculateForm which doesn't assume that a three character
long form is automatically a 10th form. Furthermore I removed the commented-out section which contained the old method for fetching data from the database.
Make Alias table editable.

By changing the displayed table to "aliasse" and adding a QSqlRelationalDelegate,
I managed to make the alias table editable and make rows removable.