Add support for Hatanaka compact RINEX format
As of 9.2, Orekit supports RINEX versions 2.x and 3.x in both raw
or compressed with UNIX compress (.Z files), but not files compressed
with Hatanaka differential method.
Such files are for example provided by UNAVCO consortium (ftp://data-out.unavco.org/pub/rinex/obs/).
The specification of the differential compression method can be found in http://cedadocs.ceda.ac.uk/1254/1/Hatanaka\_compressed\_format\_help.pdf
(from redmine: issue id 472, created on 2018-05-31)