Version 1.5.2
~~~~~~~~~~~~~
Version for DiFX-2.5 series 2.5.4, adds some upstream features from DiFX 2.6.0/.2 & Trunk:
* Support for multi-datastream entries in .difx PCAL files (r9445, r9463); rjc 2020.6.26
* Fix parallactic angle bug in first t303 record (r9575); rjc 2019.1.4
* New -w feature to allow one difx pass of mixed-bandwidth data (r8623); rjc 2018.9.14
* Trap too many channels, add -g feature to filter for freq groups (r8471); rjc 2018.8.10
* Fixed bug in case of multiple different bandwidths (r8389); rjc 2018.7.17
* Fixed too-many-pcal-tones bug for many tone case (r8374)
* Permit tab characters in VEX file (r9601)
* Propagate '-e <experiment number>' into root file fields 'exper_num' and 'corr_exp#' (r100004, r10006)

Version 1.5
~~~~~~~~~~~
Version for DiFX-2.5, May 16, 2017
* Added crossed auto correlations to type 1 files

Version 1.4
~~~~~~~~~~~
Version for DiFX-2.4, Nov 4, 2014
* support mixed/zoom mode correlations
* support version 1 file format for pcal
* in mixed mode denote sidebands as upper for hops

Version 1.3
~~~~~~~~~~~
Version for DiFX-2.3, Dec 20, 2013
* put data weights into type 120 record

Version 1.2
~~~~~~~~~~~
Version for DiFX-2.2, June 1, 2013

Version 1.1
~~~~~~~~~~~
Post DiFX 2.0.1
Version for DiFX-2.1, May 4, 2012

Version 1.0
~~~~~~~~~~~
For DiFX 2.0.1, tagged June 12, 2011