RCG: Add automated tests for building, installing and running models.

Modify test/x1tst.mdl to include every part that still works (MATRIX is broken). Add tests to build, install and run models. /opt/rtcds needs to work and be writeable by the testing user for install and run to work. tests are part of cmake and run with ctest on the command line.

assigned to @jonathan-hanks

Relates to #340 (closed) but does not close it because of #345 (closed)

merged

mentioned in commit 2d1cc38d