Adapt script find_disabled_tests for new build system

[lenaploetzke]

The find_disabled_tests script no longer works with the new build system.
The script is looking for a log file.
The location of the related log file with cmake is now build/Testing/Temporary/LastTest.log.

Also, we should document the functionality (in the README of the scripts folder and in the file itself).
Could you add some spaces to the license statement?

Estimated priority
"Priority: low" Should be solved eventually