BUG: sparse/dsolve: fix dense matrix fortran order bugs in superlu wrappers

[pv]

The splu() SuperLU wrapper has been broken since time immemorial (< 0.7.2)
for matrix inputs, because of confusion in the C code between Fortran and C
order inputs.

This is fairly simple to fix, so let's fix it. This also allows passing in dense matrices
directly to SuperLU, without needing to loop on the Python side.

Fixes gh-3363

[coveralls]

Changes Unknown when pulling 2344e41 on pv:splu-bugfix into * on scipy:master*.

[coveralls]

Coverage remained the same when pulling a18a98a on pv:splu-bugfix into 1b34692 on scipy:master.

[rgommers]

Might as well fix the typo here (sereral).

[pv]

I fix it in gh-3375 :)

[rgommers]

OK

[rgommers]

Doesn't build with Bento (edit: also not with distutils):

[ 289/1158] c: scipy/optimize/Zeros/brenth.c -> build/scipy/optimize/Zeros/brenth.c.10.o
In file included from /home/rgommers/.local/lib/python2.7/site-packages/numpy/core/include/numpy/arrayobject.h:14:0,
                 from ../scipy/sparse/linalg/dsolve/_superluobject.h:19,
                 from ../scipy/sparse/linalg/dsolve/_superluobject.c:13:
../scipy/sparse/linalg/dsolve/_superluobject.c: In function ‘SciPyLU_solve’:
../scipy/sparse/linalg/dsolve/_superluobject.c:85:9: error: ‘NPY_ARRAY_F_CONTIGUOUS’ undeclared (first use in this function)
         NPY_ARRAY_F_CONTIGUOUS | NPY_ARRAY_ENSURECOPY);
         ^
/home/rgommers/.local/lib/python2.7/site-packages/numpy/core/include/numpy/ndarrayobject.h:98:28: note: in definition of macro ‘PyArray_FROMANY’
                         (((flags) & NPY_ENSURECOPY) ?                         \
                            ^
compilation terminated due to -Wfatal-errors.
In file included from ../scipy/sparse/sparsetools/py3k.h:23:0,
                 from ../scipy/sparse/sparsetools/coo_wrap.cxx:3054:
/home/rgommers/.local/lib/python2.7/site-packages/numpy/core/include/numpy/npy_3kcompat.h: In function ‘PyObject* npy_PyFile_OpenFile(PyObject*, char*)’:
/home/rgommers/.local/lib/python2.7/site-packages/numpy/core/include/numpy/npy_3kcompat.h:258:60: warning: deprecated conversion from string constant to ‘char*’ [-Wwrite-strings]
     return PyObject_CallFunction(open, "Os", filename, mode);

[rgommers]

Since this builds on Travis, likely related to numpy version (I use 1.5.1).

[pv]

The failure is due to Numpy 1.5. Fixed. (We should make one of the travis builds use this Numpy version, so these issues would be easier to catch.)

[coveralls]

Coverage remained the same when pulling 8b9cdef on pv:splu-bugfix into 1b34692 on scipy:master.

[rgommers]

Works for me now, so in it goes. Thanks @pv