coders_widgets and formtable now require manually activation

I checked this out.
the CVS version does actually still try to enable them when required, although 'refreshing' the page doesn't show the change, 'revisiting' it does. Something to do with the form API caching a configuration I guess.
I've re-worded the notification appropriately.

These widgets are desperately required (at the moment) for the rest of the module to work at all, so I'll continue doing it automatically. If it just warns about it once, and the proper steps are not taken, everything will die horribly a few screens later. Checking if they are available every time I want to use them is a bit annoying.

Movements are afoot to integrate what I do with form_table into core, so hopefully there will be a nicer shortcut soon.