(WIP) document rewriting steps in relnotes, rewrite steps
temporary TODO.txt
(WIP) new addLog API - but still talking to status

..so don't call data API

Also:
 - addCompleteLog
 - addHTMLLog
addLog: implement smooth transition for custom buildstep

+ Fix remaining tests

Signed-off-by: Pierre Tardy <pierre.tardy@intel.com>