* new PseudoVoigt1dasym function implementing an asymmetric PseudoVoigt peak
* FuzzyGridder1D: improved 1D gridder using a range of value for each data
point
* fix memory leak in XRDMLFile by abandoning minidom
* edf-parser improvements: support for multiple images per file
* spec-parser improvements, keep file closed when not parsing it
* peak_fit: linear background feature
* peak_fit function: enhancement of automatic initial parameter determination
* improvements in the Material.environment function (occupancy awareness)
* reciprocal space conversion for goniometers with translation-axis in the
detector arms (point, linear, area detectors)
* reciprocal space conversion of energy scans for point, linear, area
detectors
* addition of serval test routines to improve the code quality