Quick temporary hack to fix curcell refreshing.

Quick temporary hack to fix curcell refreshing.

The problem was caused by change: 2015-04-13 Deprecate `intangible'
and `point-entered' properties. The problem is that this change has
removed the (setq ses--curcell t) setting in the ses-command-hook
function.

* ses.el (ses-check-curcell): replace `(eq ses--curcell t)' by just `t' as
a condition to call function `ses-set-curcell'. Comment this as a quick
temporary hack to make it work, as I don't know yet whether a definite
correction would be to make the ses-set-curcell at every ses-check-curcell,
or to revert to the previous approach, ie marking ses--curcell as out-of-date
at every potentially cursor motion command.