PDF will add automated figure numbering across chapters

No "Figure " caption at html,
we might show it via css, as captions are class caption
in the generated html

Change-Id: If915d75a6c0785c747ffd56cd2f2c6500d887756
Repair several conversion problems

* emphasized inside links doesn't work easily in sphinx
* complex tables are not correctly converted

Change-Id: I4d14dbe71a52ccffd538a72b73a9a77cf744c846