Add link to OpticalChannels to TwoPhotonSeries

[ajtritt]

1) Feature Request

Add ability to specify which channel/emission wavelength a two-photon series image stack was generated from.

Problem/Use Case

As the schema and API currently stand, there is no way to link emission channel between the ImagingPlane container and TwoPhotonSeries.

Solution

Add dataset of object references that link to the optical channels that each image stack was recorded from. The TwoPhotonSeries constructor can the take a list of OpticalChannel objects. In the event that only a emission wavelength was recorded, the TwoPhotonSeries should be able to accept an ImagingPlane alone.

Checklist

• Have you ensured the feature or change was not already reported ?
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• Have you included a minimal code snippet that reproduces the issue you are encountering?