Renabling downloading sample data for dashboards and guarding tests.

It looks like 3 tests require the sample data to be available. So
I reenabled downloading the sample data for the dashboards. I also
guarded the tests to make sure that the sample data is downloaded
before enabling the tests.
Merge remote-tracking branch 'devel/129_fix_cmake_typos' into devel-master

Conflicts:
	CMake/dashboard/meryem.cmake