Removed user interface

User interface will move to its own project.
This project contain application logic.
Merge branch 'master' of github.com:gertwin/DBoard

Conflicts:
	dboard/reader.py
	src/kernel/dberror.py
	src/kernel/loadcasetable.py
	src/kernel/memberloadtable.py
	src/kernel/membertable.py
	src/kernel/nodeloadtable.py
	src/kernel/nodetable.py
	src/kernel/structtable.py
	src/uix/forms/importform.py
	src/uix/toolbar/filetoolbar.py