Moved TestConfig tests into config.  Reworked two jp2k tests.

The jp2k tests were relying on the OPJ_DATA_ROOT test files, which was
not necessary.  #105
Added check for rlevel=-1 for openjpeg 1.5.  Added 2.x tests to 1.5 suite.

Closes #106
Trying to install debs for numpy and matplotlib instead of pip
Don't need matplotlib yet, try python-numpy instead of numpy.
No need to use apt-get with numpy, and then also install with pip

still on #105
Must explicitly check max rlevel on 1.x versions of library.

Otherwise it errors badly on 1.5, segfaults on 1.3.  Closes #106.
Merge branch 'issue105' into devel