Xrayutilities

* 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

* fix bug in Q2Ang with refrac = True (omega angle could have been reported
incorrect and added some geometry checks/warnings)
* more flexibility in sample position/orientation definition
* documentation updates
* small bug fixes in matplotlib import code
* c-header-code cleanup
* reformat c-code to conform to PEP7
* reformat python code to conform to PEP8

* new 1D Gridder working consistent with 2D and 3D
* add easy Powder Diffraction cif file parser
* addition of several test routines to improve the code quality
* new mathematical functions in math subpackage
* fixes for possible segfault in the Gridder classes
* considerable reduce size of elements.db file
* FastScan parser for spec-mesh scans and FastScan/kmap data from ESRF
(thanks to RG for help with testing and implementation ideas)
* code-cleanup
* minimal bug-fixes in io (xrdml)
* documentation updates
* add environment function to Materials: function calculates the atomic
neighbors around a given position in the unit cell
* documentation update regarding the Q2Ang and Q2AngFit functions
* fixed inconsistency bug in NonCOP and HXRD's Q2Ang function (thanks to FZ)
* SPEC-file parser improvements
* python3.X compatibilty in single code-base

* new way of accessing spec-scans when parsing the spec file
new: spec scans can be directly accessed with there spec-scan-number
* sequential gridding: usage improvements
* sample displacement error consideration in qconversion (experimental)
* new Q2AngFit function able to fit the goniometer angles or a q-vector
* minor fixes in the CIF file parser
* add workaround for internal coordinate system definition in the experiment
class
* new getxrdml_scan function to read (multiple) XRDML-files
* fixes for the getxrdml_map function
* add packaging instructions for WIN64

* Documentation updates
* minor compiler warning fixes and small bug fixes (line cut routines,
EDF file reading)
* more flexible shape of data arrays for Ang2Q function
* minor improvements of the spec-file parser
* added KeepData option to Gridders in 1,2,3 dimensions (sequential gridding)
* implement possibility to read gzipped, bzipped data files
(available for most data file readers)

* bugfix in GID experimental class: qconv argument so far not used correctly!
* enhanced fitting routines
* spec files can now be parsed while gzipped
* CBF file parser for detector images
* compile fixes for Microsoft compilers
* compile fixes on Mac
* new predefined materials (NaCl, FeO, Fe3O4, Co3O4,...)
* some minor bug fixes