awg.py: use Thread.is_alive() instead of isAlive()

See merge request !14

isAlive() was removed in python 3.9:
https://github.com/python/cpython/issues/81985

Fix zroots method in foton.py.in

See merge request !12

Failed zroot filter creation

Also update testpoint.c to include its own header file

this brings in a patch from the conda recipe.  I'm trying to make a clean conda recipe.

DTT now detects which version of awg interface is in use and picks the right one. Closes #291.

Closes #291

See merge request cds/software/dtt!11

Version 4 has only two test point interfaces: one for excitations and one for everything else
Version 3 has 4, divided between LSC and ASC test points.

DTT now detects how many interfaces are available and chooses the interface version accordingly.

Adds the python foton unit tests to ctest.

See merge request cds/dtt!10

Python unit tests for foton.

See merge request cds/dtt!9

This is to be integrated into ctest to replace foton_test.py.

solves problem of references params being saved with lower precision than the same params from results traces

Also improves precision saved to xml

Would cause double free in case of failure to clear a testpoint

Foton reference traces were shifting backward in time when step response button was pushed.  This was due to the response calculations using the current time
as an offset whenever the step response button was pushed.

Update with gds files from advligorts

See merge request cds/dtt!8

compiles.  Diag shows all test points.