add explicit link rule to makefiles
Merge pull request #79 from Waldteufel/fix-makefile

add explicit link rule to makefiles
UMVE: (re)add mouse selection in scene inspect
Merge pull request #76 from Waldteufel/umve-selection

UMVE: (re)add mouse selection in scene inspect
TESTS: Moved gtests to a separate tests directory
UMVE: support loading tabs from plugins
Merge pull request #80 from Waldteufel/umve-plugins

UMVE: support loading tabs from plugins
TESTS: Added pthread flag to compiler options
MATH: Added value iterators to math::Matrix