Swapped ama.read2pt to accept numpy arrays to make it more modular
Removed commented-out cimport in combinatorics.pyx
Added some comments to the combine_traces function.
Added specific load correlators and load_traces functions to fileio
Added cython function to sum the products when doing the trace combinations
Added fileio to package init
Added function to split a numpy array with traces into timeslices and traces.
Change pyximport to allow reloads in correlators.
And extraction of real part of timeslice data to preven warnings.
Set combine_traces function to use sum_prods cython function.