Ch.elexis.base.messages

Hello - I just converted elexis-nachrichten from 2.1.7 to 3.0.
Tested on my db. It correctly sends messages, also saves them correctly to Pendenzen if wanted.

I renamed from ch.elexis.messages to ch.elexis.base.messages througout the plugin, hoping that this follows the rules...
I also did a small interface correction: when changing the sender it did not update the layout, thus cutting off the sender name in some cases - now it works correctly, updating the layout.

...and I am still fighting with git - the last commit a87775d contains all the efective changes. Im trying to give my best  ;-)

May be someone could look at it to control if everything is ok and follows the rules.

Thanks, Harry