[NeuralynxRawIO] Test data and fixes for BML style ncs files.

[PeterNSteinmetz]

Provides some fixes and test data for BML style Neuralynx .ncs files which have fractional sampling frequencies and microsPerSamp.

Best merged here after PR #890 is merged.

This will not pass integrations tests until GIN PR #23 is merged into master there.

[pep8speaks]

Hello @PeterNSteinmetz! Thanks for opening this PR. We checked the lines you've touched for PEP 8 issues, and found:

• In the file neo/rawio/neuralynxrawio.py:

Line 540:66: W504 line break after binary operator
Line 541:72: W504 line break after binary operator
Line 542:68: W504 line break after binary operator
Line 597:32: W504 line break after binary operator
Line 639:25: E116 unexpected indentation (comment)
Line 667:82: W504 line break after binary operator
Line 779:82: W504 line break after binary operator
Line 801:45: E126 continuation line over-indented for hanging indent
Line 844:41: E126 continuation line over-indented for hanging indent
Line 850:41: E126 continuation line over-indented for hanging indent
Line 875:45: E126 continuation line over-indented for hanging indent

[PeterNSteinmetz]

Ignoring these line break and indent PEP8 comments as before.

[PeterNSteinmetz]

This should pass tests when gin pull request #23 is merged into master there.

[PeterNSteinmetz]

Holding off on creating other pull requests until the preceding and this are merged into base master. There has started to be too much divergence.

[JuliaSprenger]

Hi @PeterNSteinmetz, sorry for the delay, we are in the process of making a new release, so there's a quite a bit moving currently. I will come back to you when things have settled again.

[PeterNSteinmetz]

Closed and incorporated into new PR.