[gpsd-dev] A Couple of xxGSV Fixes

[Fred Wright]

I have three commits that fix a couple of bugs in the GSV handling (one
also affecting xxGSA), as well as fixing two affected regression cases and
adding a new one.  Two of the three commits aren't email-compatible due to
the long lines in the .chk files.  There are a few ways around this, but
the simplest would be for someone with commit access to fetch the commits
from my GitHub.  E.g.:

MacPro:gpsd fw$ git fetch https://github.com/fhgwright/gpsd.git 
+code-fixes:foobar
remote: Counting objects: 16, done.
remote: Compressing objects: 100% (16/16), done.
remote: Total 16 (delta 6), reused 0 (delta 0), pack-reused 0
Unpacking objects: 100% (16/16), done.
>From https://github.com/fhgwright/gpsd
 * [new branch]      code-fixes -> foobar

Where "foobar" can be any local branch name of your choosing.  Then the
commits are locally available, and the usual git tools can be used to
examine and/or merge them (with "git cherry-pick" replacing "git am").

The combined diff can be seen online here:

        https://github.com/fhgwright/gpsd/compare/master...code-fixes

Click on any ellipsis gadget to see the full commit message.

The local branch can be deleted after merging.

BTW, I believe a couple of the offsets in nmeaid_to_prn() are incorrect.
I have no idea where the 37 for GLONASS came from, but I think it should
be 64, and I also think that the QZSS offset should be 192, not 193, since
the intent is to map *1* to 193.  I left these alone for now.

Fred Wright