Fixed: property seed is no longer G_PARAM_CONSTRUCT (ncm_rng.c).

Included a supernovae sample from SDSS provided by Emille Ishida.
Better support for blas and lapack search in configure and code organization and new NcmABC.

Better support for searching blas and lapack libs through ax_blas and ax_lapack.
Organized lapack calling code in ncm_lapack.
Renamed NcmMCSampler to NcmMSetTransKern (transition kernel) to better represent the object functions.
NcmMSetTransKern can also be used as a prior (fixing one of the points).
Added NcmMSetTransFlat to work as a flat transition kernel or prior.
Adapted NcmFitMCMC to use NcmMSetTransKern.
Renamed NcmFitCatalog to NcmMSetCatalog to better represent the object functions.
Removed old cvode_util reorganized its code in ncm_util.

New NcmABC (Approximate Bayesian Computation) object, abstract object used to perform ABC analysis.
Merge branch 'master' of git.sv.gnu.org:/srv/git/numcosmo