Updated version and changelog.
Fixed a problem with building of test fixtures

- Added a more informative message when an unsupported implementation
  of GL initialization library is chosed when building the test fixture.
Fixed a problem with building of test fixtures

- Added a more informative message when an unsupported implementation
  of GL initialization library is chosed when building the test fixture.
Removed obsolete options from Doxyfile
Merge branch 'release-0.30.0' into develop