Caching the symbolic Cholesky factorization when using CXSparse

Average factorization times for bundle adjustment test problem:
SuiteSparse: 0.2794 s.
CXSparse: 0.4039 s.
CXSparse cached: 0.2399 s.

CXSparse will still be slower, though, because it has to compute
the transpose and J^T * J.

Change-Id: If9cdaa3dd520bee84b56e5fd4953b56a93db6bde