HaikuDepot: Avoid showing ugly rating info when there are no ratings.
Update support kit documentation to the latest changes on trunk

SetSubDirSupportedPlatformsBeOSCompatible ;
Merge all the documentation from Archivable.h together
Add HOST_LIBSUPC++ to fix compilation on MacOS X
Set defines for Mac OS X so that libsolv can be built
shasum -a 256 is an alternative for sha256 on Mac OS X

First set of patches from #10028