Ability to make new project

Menubutton “New” now clears everything.
Left to do: Redraw loaded data-table.
remove data, clear all

* Loaded data can now be unloaded.
* The “new” feature now clears everything.
*The loadfunction now swaps tabs like on startup
Continued work on tfclass. Added mathematica mathlink.
Merge remote-tracking branch 'origin/GUI'