Pyrtcm

What's Changed
* RELEASE CANDIDATE 1.0.17 by semuadmin in https://github.com/semuconsulting/pyrtcm/pull/53

ENHANCEMENTS:

1. Add proprietary IGS SSR 4076 messages, as defined in https://files.igs.org/pub/data/format/igs_ssr_v1.pdf. NB not fully tested as available NTRIP sources only cover a subset of the 4076 subtypes defined.

**Full Changelog**: https://github.com/semuconsulting/pyrtcm/compare/v1.0.16...v1.0.17

What's Changed
* RELEASE CANDIDATE 1.0.16 by semuadmin in https://github.com/semuconsulting/pyrtcm/pull/49


1. PRN SIG mapping streamlined - id2prnsigmap() helper method replaced by dictionary PRNSIGMAP.
1. Various minor internal refactoring.

**Full Changelog**: https://github.com/semuconsulting/pyrtcm/compare/v1.0.15...v1.0.16

What's Changed
* RELEASE CANDIDATE 1.0.15 by semuadmin in https://github.com/semuconsulting/pyrtcm/pull/48

CHANGES:

1. MSM GNSSEpoch field now parsed into appropriate datafield(s) e.g. GLONASS GNSSEpoch = {"DF416": "GLONASS Day Of Week", "DF034": "GLONASS Epoch Time (tk)"}.
2. MSM Extended Satellite Information field parsed into appropriate datafield e.g. DF419 for GLONASS, ExtSatInfo for other GNSS.


**Full Changelog**: https://github.com/semuconsulting/pyrtcm/compare/v1.0.14...v1.0.15

What's Changed

1. Minor internal streamlining of RTCM 1230 message processing.

* Rc 1.0.14 by semuadmin in https://github.com/semuconsulting/pyrtcm/pull/45

**Full Changelog**: https://github.com/semuconsulting/pyrtcm/compare/v1.0.13...v1.0.14