added another population generation method that will place waveforms with fixed hrss randomly through the sky
fixed a bug with variable_bandwidth_mp that caused EOFErrors
fixed a bug in __call__ and changed log_posterior_elements so we do not cast through array assignment, but rather only take real parts. Verified that the imaginary parts do vanish as expected
fixed problems with network.AB and optimized the calculation of A (in both network.A and network.AB) a bit
various futzing and fixing to make these more useful tests