Aqms client

[mikehagerty]

What does this PR do?

Please fill in

Why was it initiated? Any relevant Issues?

This branch was created to add a new aqms proxy waveserver (PWS) client

Please fill in (link relevant issues with "see #123456", mark issues that get resolved with "fixes #12345")

PR Checklist

• Correct base branch selected? master for new features, maintenance_... for bug fixes

• This PR is not directly related to an existing issue (which has no PR yet).

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  Just add the build_docs tag to this PR.
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  just add the test_network tag to this PR.

• All tests still pass.

• Any new features or fixed regressions are covered via new tests.
  **There's no way to do this as all of the PWS I know of are behind VPNs ! **

• Any new or changed features are fully documented.

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[mikehagerty]

Here are some things I had to fix (I made these changes for my own testing
but did not check them into my fork)

1. setup.py - I had to manually set the version as the tag that get_git_version() gets
   is rejected by pip so that: >pip install -e fails
   This is true on both mac osx + linux

The next 2 issues were only for linux [ gcc version 4.8.5 20150623 (Red Hat 4.8.5-44) (GCC) ]

2. On linux I get gcc errors on signal/src/aic_simple.c due to initial declarations in loop
   gcc -pthread -B /home/aqms/anaconda3/envs/test-mth/compiler_compat -Wno-unused-result -Wsign-compare -DNDEBUG -fwrapv -O2 -Wall -fPIC -O2 -isystem /home/aqms/anaconda3/envs/test-mth/include -fPIC -O2 -isystem /home/aqms/anaconda3/envs/test-mth/include -fPIC -I/home/aqms/anaconda3/envs/test-mth/include/python3.10 -c obspy/signal/src/aic_simple.c -o /tmp/tmpngtpkbiv.build-temp/obspy/signal/src/aic_simple.o
   obspy/signal/src/aic_simple.c: In function ‘aic_simple’:
   obspy/signal/src/aic_simple.c:40:9: error: ‘for’ loop initial declarations are only allowed in C99 mode
   for (int i = 0; i < size; i++) {
   ^
   obspy/signal/src/aic_simple.c:40:9: note: use option -std=c99 or -std=gnu99 to compile your code
   obspy/signal/src/aic_simple.c:40:27: warning: comparison between signed and unsigned integer expressions [-Wsign-compare]
   for (int i = 0; i < size; i++) {

I "fixed" this by adding -C99 flags in setup.py, e.g., under SIGNAL:
kwargs['extra_compile_args'] = ['-std=c99']

3. However, this "fix" then causes a new problem, c99 doesn't have math.h so M_PI
   is undefined in signal/src/lanczos_resampling.c so I have to
   fix it there:
   signal/src/lanczos_resampling.c :
   /* MTH: -c99 doesn't have math.h hence no M_PI! /
   #ifndef M_PI
   #define M_PI (3.14159265358979323846264338327950288)
   #endif / M_PI */

I realize there is probably a better way to resolve 2. so that 3. doesn't occur ...
just thought I'd point out the steps I had to take to get this running on redhat.

Also, as this client connects to aqms proxy waveservers and the only ones I know
of are behind VPNs (so that I can't even connect to them from my own machine),
I didn't write any tests, etc.

[megies]

@mikehagerty, I'm not really sure how to proceed here. All the issues there we could figure out, but adding a client for which we can't test because there is no servers to try is a bit of a weird one. Any chance there might be an open server to test against anytime soon?