* arts-2-1-855

* cmake/modules/ArtsTestcases.cmake, controlfiles/CMakeLists.txt:

Change naming scheme of testcases. Generate the name automatically from
the controlfile path (just replacing the directory separator / with .):

Old: arts.ctlfile.fast.pencilbeam
New: arts.ctlfile.fast.artscomponents.pencilbeam.TestPencilBeam

This change makes it much easier to identify the controlfile that
belongs to each testcase. Omits the need to run
'ctest -V -N -R arts.ctlfile.fast.pencilbeam' to find out.
Requested by Jana.

Note that because the testnames are now longer than before, a terminal
window wider than 120 chars is required for clean output.

git-svn-id: https://www.sat.ltu.se/svn/rt/arts/trunk@8824 aaf1aab0-4228-0410-ad68-8dceda47f409