Fixed size of resources used by watched robots

Size was zero.
Removed obsolete file
Fixed a robot training bug

Caused by adding a not-so-new newly created widget.
If a watched robot is hidden it runs unwatched
Geometry of backside widgets preserved

Only widgets without parents or on the backside add geometry to their
JSON view. Fixes #24.

Also fixes problem where first step of watched robot that was dragged to
a window is instantaneous..
Removed obsolete parameters

'box' for TT.box_empty_hole.create
and
'container' for copy
Top-level widget is not on the backside
Need to check visibility before executing drop

Since might change the 'parent'.
Added Fibonacci test
Box size doesn't change

When a big number is dropped inside.
Fixed confusion between front and back side drops

For example, dropping a backside of a frontside on a backside moved the
frontside and changed its size sometimes.
Watched robots can now remove widgets

By 'clicking' the remove button
Robot button clicks now change the CSS

So it is easier to see that the button is being clicked.
Watched robots can perform edit actions

They can move to the appropriate input element and re-create the action.