[MATLAB] initial attempt to get test-suite to work

Added matlab to configure.ac etc and checked in a few *runme.m.
Currently I get warnings about try-catch syntax (on matlab 2012a) but
it does work.

Examples/test-suite/matlab/Makefile.in attempts to disable tests with
directors as these are known to fail. That will have to be removed later.
i[MATLAB] simplified configure.ac

use AC_PATH_PROG also for mexext, and thereby remove any lines copied
from a configure.ac that is licensed under the Eclipse license.
[MATLAB] another fix related to passing mxArray
[MATLAB] stripped directory info when calling wrapper in .m files

when doing out-of-source builds, the .m files had full path-info
embedded when calling the wrapper mex, but that doesn't work in matlab.
(problem found by Ian Bell)
[MATLAB] small fixes for containers

errors where due to replacement of octave type with mxArray* (const
was in the wrong place)