more metadata fix

[jihyunbak]

Description and related issues

This PR fixes various metadata issues.

Closes #55 Closes #66 Closes #53 Resolves already closed issue #48 Closes #47

Checklist:

• [ ] All tests pass on catscan: run pytest --basetemp=tmp -sv -n 8 tests on catscan from the root directory
• [ ] If needed, docs have been update: docs/source has been updated for any added, moved, or removed files
• [x] Docs build with no errors: run make clean & make html from the docs folder
• [ ] No python formatting errors: run flake8 nsds_lab_to_nwb tests from the root directory
  • [x] cleared for files changed in this PR only

[jihyunbak]

This PR is ready for review again. @JesseLivezey @jthermiz

[jihyunbak]

@JesseLivezey Here's the output from test_catscan.py. Lines are hard truncated to my window width...

==================================== short test summary info =====================================
FAILED test_catscan.py::test_nwb_builder[RVG16_B04] - FileNotFoundError: [Errno 2] No such file...
FAILED test_catscan.py::test_nwb_builder[RVG16_B02] - FileNotFoundError: [Errno 2] No such file...
FAILED test_catscan.py::test_nwb_builder[RVG16_B05] - FileNotFoundError: [Errno 2] No such file...
FAILED test_catscan.py::test_nwb_builder[RVG16_B09] - ValueError: Stimulus type 'nan' not found.
FAILED test_catscan.py::test_nwb_builder[RVG16_B10] - ValueError: Unknown stimulus type '{stim_...
FAILED test_catscan.py::test_nwb_builder[RVG16_B07] - OSError: Unable to open file (unable to o...
FAILED test_catscan.py::test_nwb_builder[RVG16_B06] - OSError: Unable to open file (unable to o...
FAILED test_catscan.py::test_nwb_builder[RVG16_B08] - FileNotFoundError: [Errno 2] No such file...
FAILED test_catscan.py::test_legacy_nwb_builder[R56_B10] - OSError: Unable to open file (unable...
============================ 9 failed, 3 passed in 140.03s (0:02:20) ============================