added missing isherm flag to calls to cy_expect_psi_csr
code cleanup
fix return type for d2_psi_photocurrent
bugfix, use axis=2 with np.sum when replacing python sum
use blas norm function
removing commented code, docstring fixes
temporary fix with a work-around for that sp.vstack produces sparse matrices with indices,indptr with dtype int64 instead of int32 (which breaks our cython code)
more precise and consistent types for sparse matrix functions
Merge branch 'master' of https://github.com/qutip/qutip into work-on-sesolve
added basic unit tests for stochastic me and se solvers
Merge pull request #86 from jrjohansson/work-on-sesolve

Work on ssesolve