* make KDE support work again
After cleaning up the autotools config, twinkle only builds with
--without-kde. This is only temporary, the goal is to allow building
against KDE4 libraries (and, preferrably, also KDE5).
* IPv6 support
Still missing, AFAIK.
* t_gui locking
Dirty workaround for (mostly) calling GUI related methods from non-GUI
threads. Doesn't actually work with Qt4, causing segfaults. Analyze
the remaining uses and get rid of it.
* MEMMAN_* tracking macros
Ugly and unreliable (too easy to forget adding them). Either replace
them with overloaded new and delete operators or kill them completely
and rely on valgrind.