Done by running misc/scripts/inc_release, manually updating version.bkl,
rebaking and rerunning autoconf.
Also a header for the next version to the change log.
This basically removes the "adv" library, even though it's still
preserved for compatibility with user make/project files referring to
it.
It is done because the distinction between "adv" and "core" was never
really clear (e.g. why wxTreeCtrl was in core but wxTreeListCtrl in
adv?) and it prevented some core classes from using adv ones.
Update misc/scripts/inc_release script: remove non-existent any more files and
update the version in the MSVS 200x project files not generated by bakefile
any more and MSVS 201x project files which were not previously taken into
account.
Run it and rebake.
