Use pvxslibs instead of qsrv

[coretl]

This is not currently working

[coretl]

@mdavidsaver I'm trying to use QSRV2 in pythonSoftIOC, but I'm missing something. When I make the changes in this PR, install into a venv, and run venv/bin/python docs/examples/example_asyncio_ioc.py I get:

Unable to find symbol 'pvar_dset_devLoPDBQ2UTag' : /venv/lib/python3.10/site-packages/epicscorelibs/lib/libdbCore.so.7.0.7.99.0: undefined symbol: pvar_dset_devLoPDBQ2UTag
Unable to find dset for record type 'longin' support 'devLoPDBQ2UTag' : (null)
Traceback (most recent call last):
  File "/pythonSoftIOC/docs/examples/example_asyncio_ioc.py", line 2, in <module>
    from softioc import softioc, builder, asyncio_dispatcher
  File "/venv/lib/python3.10/site-packages/softioc/__init__.py", line 28, in <module>
    raise RuntimeError('Error registering')
RuntimeError: Error registering

I thought these symbols might have been from the demo application, so commented out everything apart from the registrar calls in pvxsIoc.dbd, but then I get:

Unable to find symbol 'pvar_func_pvxsBaseRegistrar' : /venv/lib/python3.10/site-packages/epicscorelibs/lib/libdbCore.so.7.0.7.99.0: undefined symbol: pvar_func_pvxsBaseRegistrar
Unable to find registrar 'pvxsBaseRegistrar' : (null)
Traceback (most recent call last):
  File "/pythonSoftIOC/docs/examples/example_asyncio_ioc.py", line 2, in <module>
    from softioc import softioc, builder, asyncio_dispatcher
  File "/venv/lib/python3.10/site-packages/softioc/__init__.py", line 28, in <module>
    raise RuntimeError('Error registering')
RuntimeError: Error registering

I see these same errors when importing in CI:
https://github.com/dls-controls/pythonSoftIOC/actions/runs/5189205532/jobs/9353980317?pr=132

I am using pvxslibs 1.2.1a1.

I added the DSOs and include path in setup.py, then loaded the dbd in __init__.py, is there anything I missed?

[github-actions]

Unit Test Results

     15 files  ±0       15 suites  ±0   28m 54s ⏱️ + 2m 27s
   273 tests ±0     257 ✔️ ±0    16 💤 ±0  0 ❌ ±0 
4 095 runs  ±0  3 505 ✔️ ±0  590 💤 ±0  0 ❌ ±0 

Results for commit 6a99229. ± Comparison against base commit c826477.

♻️ This comment has been updated with latest results.

[codecov]

Codecov Report

Merging #132 (6a99229) into master (860f59c) will increase coverage by 0.21%.
The diff coverage is 100.00%.

@@            Coverage Diff             @@
##           master     #132      +/-   ##
==========================================
+ Coverage   87.34%   87.56%   +0.21%     
==========================================
  Files          14       14              
  Lines         996     1005       +9     
==========================================
+ Hits          870      880      +10     
+ Misses        126      125       -1     

Impacted Files	Coverage Δ
softioc/__init__.py	95.00% <100.00%> (+2.14%)	⬆️
softioc/builder.py	97.68% <100.00%> (+0.04%)	⬆️

... and 1 file with indirect coverage changes

[coretl]

This makes QSRV2 treat a waveform as a string...

[coretl]

... but only if FTVL is CHAR

[coretl]

pvxslibs needs to be loaded here, rather than linked in like dbCore, etc

[AlexanderWells-diamond]

Looks good to me. At some point we may want to add more tests for various other QSRV features but this is fine for now.

Once this is merged could you also close #133 ?