This commit re-enable the table adjustment with screen whenever the table is bigger...

This commit re-enable the table adjustment with screen whenever the table is bigger than the screen. Here is some explanation form Georg about the setPos() method:

I believe that it is for horizontal
"scrolling": If you have a table that is wider than the screen and you go
to a cell that is at the right edge then, if you are lucky, the table is
shifted to the left so that you can edit the cell and even go further
right. This does however not work reliably.
If I am right then the variable name scx_ would make some sense: sc for
scrolling. The ChangeLog comments also seem to point in this direction. And
most of them were done by Jürgen Vigna who is AFAIK in Denmark.

git-svn-id: svn://svn.lyx.org/lyx/lyx-devel/trunk@15414 a592a061-630c-0410-9148-cb99ea01b6c8