Removed matrix_trace, duplicate of tr
Added register_module to ptrdict interface.
Added MIN/MAX functions to linearalgebra.h file
Changed GPL header.
Added more extensive linear algebra functionality - including trnasparent CUDA support.
Added non-orthogonal tight-binding potential with charge self-consistency.
Add source directory to Python search path.
Correct signature of set_Hubbard_U
Added nonunform_spline to support library module.