Expose pure MASA c++ interface #26

Instead of forcing user to call sets of functions, al la:

masa_init();
masa_init_param();
masa_sanity_check();

etc.

Put together the c++ interface so that all are member functions of a masa class, i.e.:

MASA foo;
foo.init();
foo.init_param();
foo.sanity();

etc.

Should not be too hard. Will require reworking masa core routines, as well as wrappers for c and fortran. Also, all cpp regression tests will need fixin'.

Was requested by @pbauman and @vikramvgarg. This is not an API change but significant enough I would like it to be independent of current masa release targets (0.44). Likely will be named 0.50.