revamp sparse Cholesky factorization classes * sparse-chol.h, sparse-chol.cc: Rename from sparse-base-chol.h and sparse-base-chol.cc, respectively. (class sparse_chol): Rename from sparse_base_chol. Incorporate code from SparseCmplxCHOL and SparsedbleCHOL classes into the sparse_chol template. Hide representation and HAVE_CHOLMOD macro from public interface. * sparse-chol-inst.cc: New file. * SparseCmplxCHOL.cc, SparseCmplxCHOL.h, SparsedbleCHOL.cc, SparsedbleCHOL.h: Delete. * chol.cc, symbfact.cc, CSparse.cc, dSparse.cc, eigs-base.cc: Change all uses of SparsedbleCHOL and SparseCmplxCHOL to use new sparse_chol template class. * liboctave/numeric/module.mk: Update.

gnulib-hg = gnulib-hg