* Add THtml::IncludePath(): remove parts of DeclFileName() for the class info...

* Add THtml::IncludePath(): remove parts of DeclFileName() for the class info box (e.g. "include/" for ROOT), instead of using BaseName(). Fixes problem with e.g. MathCore's Whatever.h instead of the proper Math/GenVector/Whatever.h.
* Add static THtml::LoadAllLibs(): load all libraries for all classes known via rootmaps, without re-loading dependent libraries. Handy for generating doc for all classes.
* Clean THtml.cxx include files.


git-svn-id: http://root.cern.ch/svn/root/trunk@19494 27541ba8-7e3a-0410-8455-c3a389f83636