Fixes for slow channel switching

This fixes and closes #2132.
Add proper less to image (disable busybox less)

The version of less in busybox is quite annoying when working on OpenELEC. It doesn't properly support searching in files or tailing (and interrupting) logfiles. It also doesn't properly handle non-ascii characters. This patch disables busybox less and instead adds the latest stable less release.
service.openelec.settings: update to service.openelec.settings-0.1.15
vdr-plugin-xmltv2vdr: ups. depend on libxml2, not libxml
Merge branch 'master' of github.com:OpenELEC/OpenELEC.tv
mysql: update to mysql-5.1.68

Signed-off-by: Stephan Raue <stephan@openelec.tv>
Merge branch 'master' of github.com:OpenELEC/OpenELEC.tv
xrandr: switch off only HDMI/DFP/CRT outputs on suspend
Replace busybox free with *real* free from procps-ng

Busybox free reports incorrectly the used and free memory on a system. Which makes it harder to understand and compare information from other sources.

In the same effort we add some other useful procps-ng tools, like pgrep, pkill, pmap, slabtop, vmstat and watch.
xbmc: update to xbmc-83b16d0

Signed-off-by: Stephan Raue <stephan@openelec.tv>
linux: update to linux-3.8.8

Signed-off-by: Stephan Raue <stephan@openelec.tv>
Merge branch 'master' of github.com:OpenELEC/OpenELEC.tv
linux: temporary remove dvbsky patch for now, on request from DVBSky

Signed-off-by: Stephan Raue <stephan@openelec.tv>
scripts/image: add support to define official builds

Signed-off-by: Stephan Raue <stephan@openelec.tv>
linux: readd DVBSky patch

Signed-off-by: Stephan Raue <stephan@openelec.tv>
xbmc: add PR2637

Signed-off-by: Stephan Raue <stephan@openelec.tv>
xbmc-master: add PR2637

Signed-off-by: Stephan Raue <stephan@openelec.tv>
service.openelec.settings: update to service.openelec.settings-0.1.16

Signed-off-by: Stephan Raue <stephan@openelec.tv>
Merge pull request #2209 from dagwieers/package-less

Replace busybox less with *real* less
less: depends on ncurses, run autoreconf, cleanup

Signed-off-by: Stephan Raue <stephan@openelec.tv>