Disable the dmatrix test if BLAS and LAPACK are not used.
Bump up the version to 0.5.1.
Removed a warning showing in the no-mpi case.
Enable configure option override by environment variable.
Use environment variable override for mpi, blas, lapack options.
Disabled variadic macros and C99 prototypes for C++.
Bump up the version to 0.5.2.
Make sc_dmatrix use const.
Fix a possible leak of the data.

If n==0 and m==0 make sure that free will be called
on data.  We do this by allocating a place to store
data.
Minor internal symmetrization of memory allocation.
Made make distcheck work.
Defining MPI_UNSIGNED_LONG_LONG if not existing.
Backported a splint fix.
Bumped up the version to 0.5.3.
Allow the disabling of the options parser
Added extern C macros.
Removed some warnings on the option example.
Remvoe superfluous semicolon warning by ugly prototype hack.
Bumped up the version to 0.5.4.
Removed nonsensical extern C from .c file.