This patch adds a layer to the "load and create final TCA"
process. When "base" TCA files in 'Configuration/TCA' define
'ctrl' capabilities like 'languageField=sys_language_uid',
these fields need according 'columns' definitions.

The core now adds default definitions of such columns
if they do not exist after loading 'Configuration/TCA'
files, and before loading 'Configuration/TCA/Overrides'
files.

Developers no longer need to define such columns and
can rely on core adding them, if a capability is
enabled in 'ctrl'. There are two advantages: First,
it adds a level of control for these columns away
from extensions to the core, which is good for
future development in this area. Secondly, extension
developers no longer need to take care of nasty
configuration details of these columns and can
remove lots of boilerplace TCA definitions that had
to be maintained manually before. The patch shows
this: About 6000 lines of TCA definitions can be
removed.

These columm...