mention *_SITE variables in Manual.md
notmuch: nocross=yes
libtasn1: update to 4.1.
mtr: separate mtr-x11 package for X11 version
mtr: nocross=yes
libpano13: update to non-beta version

coincidentally this fixes the shlibs entry, which didn't deal with the
beta suffix properly.
New package: hugin-2013.0.0
acpid: update to 2.0.23.
docker: update to 1.2.0.
php: update to 5.5.16.
MesaLib: resolve conflict with catalyst/nvidia (libGL.so); close #516

Move libGL.so to the libGL pkg, this way any other pkg providing the
`libGL` virtual package won't conflict with the real `libGL` mesa pkg.
nvidia: update to 340.32.
wine: update to 1.7.25.
broadcom-wl-dkms: update to 6.30.223.248; close #501
broadcom-wl-dkms: remove obsolete patch.
New package: sbcl-1.2.2
libva: cross compile with our libtool
mpv: hostmakedepends on perl
mplayer: use runtime cpu detection only where possible
audacity: use SSE only where possible