More improvements to imagTEvol method and related supporting methods and classes. Greatly improved orthogonalization of derivative tensors to MPS tensors (so that norm of wf is preserved), including two alternative methods currently under investigation.
Fixed an uninitialized pointer warning.
Fixed overflow bug in ExpM helper class for Sweeps.
Fixed buggy constructor for class Spectrum.
Fixed bug triggered by copying an uninitialized IQCombiner. Now IQCombiner is initialized upon being copied.
Changed behavior of error/Error functions to call abort() instead of throwing an ITError. Code relying on an ITError being thrown replaced with an explicit throw ITError("Message").
Updated IQCombiner unit test to reflect new behavior when copying IQCombiners.