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rename_file: change behavior and properly remove ide related stuff.

Exceptions from transformations are of two kinds:
- fatal exception which are then raised into a popup in the ide
- normal exception which appears in the message view

fixes issue #180

fixes issue #147

         allows to remove completely some prover version

select_iter changes the cursor used by the goals_view for changing nodes
with keyboard arrow keys. selection#select_iter should be avoided alone.

Also, better errors when no node is selected.

IDE: context menu now contains more or less the items that were in the left toolbar in former versions of Why3

The new shortcut for "copy" forces to change the one for "collapse all
proven", which is now "!". The "expand all" command has been removed,
since pressing "+" twice (i.e., double expand) now has the same effect.

This is fixed at 3/4 (random) the size of the main window

doc modified accordingly

fixed doc

The contextual menu inkoved by mouse-3 is now simplified: it contains only
the strategies and the provers that are marked visible in the preferences