Release v2.2.1

Today we see a minor update of PLCEdit - Version 2.2.1. It comes with some
bug fixes and also some nice to have features. Implementations of bigger key
features will not placed this year, maybe. So, also the support of OpenPCS is
not yet included as separate entry in the open and save dialogs.

Ok, what’s changed in v2.2.1?
First of all the session manager can now redirected to a user defined path.
Use the Default button at the preferences dialog if any problem occurs with
the session manager or the selected path.
Next PLCEdit contains now an update function to inform about updates of
the application.
I tried again to fix the tab/file list bug which occurs by saving a file if some
more files are opened.