- Update XML output written by assimp dump. cameras & lights missing, document scheme as well. No guarantees that I won't change it in future without further notice (currently WIP, format to be freezed with our next release).

- Update XML output written by assimp dump. cameras & lights missing, document scheme as well. No guarantees that I won't change it in future without further notice (currently WIP, format to be freezed with our next release).
- Add dump comparison tool to assimp_cmd. It serves as the workhorse of the regression suite.

git-svn-id: https://assimp.svn.sourceforge.net/svnroot/assimp/trunk@598 67173fc5-114c-0410-ac8e-9d2fd5bffc1f