asset relative paths

[mzieg]

When running 4.0.17's run-burnin.bat from the Windows installer I found errors about missing ASTM JSON file. That's probably because it's loaded from a relative path enlighten/assets/example_data/... and run-burnin.bat is run from plugins/Prod. Consider doing an internal "change directory" as soon as ENLIGHTEN launches so it's running from the directory containing the .exe, or the directory "above" Enlighten.py if run from source.

[mzieg]

At runtime from the installer, argv[0] can contain anything from "enlighten" to "C:\Program Files\Wasatch Photonics\ENLIGHTEN\Enlighten\enlighten" (with or without .exe extension). When run from source, should always end in ".py".

[samiebee43]

Should we chdir to the dirname of arg[0] on Enlighten's start?

Using os.chdir this will only affect the python program and its descendants, not the calling shell

sbee@Samies-MBP ~ % python3 foo.py  # contains a chdir
Traceback (most recent call last):
  File "/Users/sbee/foo.py", line 2, in <module>
    os.chdir("somewhere")
FileNotFoundError: [Errno 2] No such file or directory: 'somewhere'  # errors if folder !exists
sbee@Samies-MBP ~ % mkdir somewhere
sbee@Samies-MBP ~ % python3 foo.py # contains os.chdir("somewhere")
sbee@Samies-MBP ~ % # shell path is preserved

[mzieg]

fixed in 4.1.0