Apply patches from c1eb693 on OCCT 6.7.1
Update dependencies of TKQADraw
Bump OCCT version number in README.md to 6.7.1
Fix installation of resource files for DRAW

Add src/TObj/TObj.msg, and remove several files which do
no more exist.
Merge pull request #499 from tpaviot/review/occt671

Upgrade to OCCT 6.7.1