Absorb full changelog

· ABSORB is now a stand-alone program that can be run from other data reduction programs.
· There is a new GUI to set up the description of the crystal and diamond-anvil cells in the experiment file.
· Absorption coefficients are now in mm-1.
· Sizes of DAC components are now in mm.
· New handling of negative intensities and ?(I)
· Mass absorption coefficients added for Ag radiation. And wavelength can be specified by target material.
· ABSORB ORIGIN to specify model origin.
· DAC SMALLBEAM to handle cases where the beam size is much smaller than the crystal.
· DAC CRYSTAL defined to allow ABSORB FACE cards to be used to describe a crystal in a DAC.
· DAC PHIZERO to handle DACs which are not set face-on to the incident beam.
· Improved formatting of information in print file.
· A distinction is now made between the sample coordinate system and the axis axial system.
· Further improvements to the checking of the consistency of the input information about the crystal and DAC.
· Correctio