Tweak intros to manpages. Fix category for -hhever argument.

Subversion-branch: /branches/v2-branch
Subversion-revision: 2616
Fix IWAD registry locations when using 64-bit Windows. Change imported
from Odamex r4128 (thanks AlexMax).

Subversion-branch: /branches/v2-branch
Subversion-revision: 2618
Fix IWAD auto-selection when joining a game in the setup tool (thanks
Alexandre Xavier).

Subversion-branch: /branches/v2-branch
Subversion-revision: 2619
Fix Chocolate Doom/Strife to emulate weird Vanilla behavior when the
pause key is pressed in a menu with a scroll-bar (thanks Alexandre
Xavier).

Subversion-branch: /branches/v2-branch
Subversion-revision: 2620