Gnssrefl

**Python 3.9 is now required.**

screenstats is always True now - but output goes to a file.
The file location is printed to the screen.
If this causes funny print statements please let me know.


Added RINEX 3 files for the nz archive. Minimal testing.

Changed our build to meson. This will now accommodate python >= 3.11.
It also eliminates the setup tool deprecation.

Why we did this: https://numpy.org/doc/stable/reference/distutils_status_migration.html

Remove package stored version of station_pos.db. This has been replaced by station_pos_2024.db
And it will no longer download this file if you use unr_database function.

I have been trying to make a way to save frequently used settings in rinex2snr and gnssir,
especially the snr ending, and to a lesser extent, the samplerate.
I do not want to make a brand new file, so I have added them to them gnssir json
(created by gnssir_input). So if you are going to be downloading and translating RINEX 3
files regularly, you should consider this. The relevant settings are in the gnssir_input documentation
(samplerate, stream, dec, and snr). I would not set snr unless you are using the non-default
values (88 or 50 are the most common).

When you analyze data from a lot of different sites, you might have set up scripts that
save all this information. I no longer do this - so I do like to save the information so
I don't have to remember if it is R or S (for streaming), or samplerate, or whether a site
should be decimated. It does not save the archive name or the nine character station name, which
are also useful bits of information when running rinex2snr. Someone else feel
free to add these to gnssir_input.py and rinex2snr.

If you are going to do this it does mean the json needs to be created before using rinex2snr.
And that is a bit illogical. But if you are a frequent user, you will alreayd have a json and
it will save you time. And it should not complain if it cannot find the json.

Added snr input to gnssir_input. If you have non-default SNR files (i.e. not 66), then
you can set that and not have to type it in the command line.

Added a few info messages in quickLook explaining why station coordinates are not needed
(though they are helpful). Also check that azim1 is < azim2.

Fixed a very stupid bug in conv2snr that was looking for RINEX files even though
they already existed (as nolook option was set and the file was found). Optional
filename now sent to conv2snr to make sure this choice is not made.

added savearcs_format option - allows pickle format which has more information
than plain txt version. See gnssir for more information.

removed bug in reading local coordinate file. it failed when there was only a
single station in the file. it should now work though you can't disobey the format.
you have to have four entries per line: station, lat, lon, ht. Comment lines must
have a % at the beginning.