* support for fetching only needed sources
 * always building from source tarball:
   - easier GPL compliance
   - easier offline/firewalled builds
 * shared source tarballs for all targets
 * dynamic package selection, no static distribution files
 * fixed file dependency propagation with delete on errors
 * fixed directory dependencies using atomic rename

Only ogg and tremor are in this initial version. This focuses on the
core of the system. The bulk of packages still need to be ported.

It checks if the blending will succeed with the formats we use.
It fixes the order of the RGB components (close #4919).

It is quite useless and will confuse users who want to add "film grain"
to the video.

At least the ISDB-T standard export version uses sub-kHz precision
(never mind that one band occupies several megahertz in width).

It closes #4861.
It fixes playback when the rate cannot be respected (like with dvb/udp/...)
or need to be requested to the access_demux (rtsp).

It is unrelated to dvd/bd LPCM.

This is a first step to re-organize the interface, more to come

Some people find it more readable.

It allows to avoid full rgb <-> yuv conversion at a latter stage.

The shadow is enabled by default.

They should be prefixed by '#' but it is not always done...

The quality is a lot better than what we originaly had.

The placement and thickness of the underline is now global to a whole
line of text.

Created a structure to gather all informations needed to draw one character.
It simplify a bit the code.