prepare for ffmpeg 1.2
update to 4.0.2 and implement sharedlibs ala Fedora
BuildConflicts on atlas
update to 4.0.2, implement sharedlibs ala Fedora and BuildConflicts on atlas
build demos ala stock makefile
ffmpeg 1.2
Fix doc generation in 10.4/  Switch to gcc48.
dep upgrade (esp for crypto stuff!), but there's also a much newer upstream %v todo
New upstream mercurial 2.5.3.