consistency in time columns of stimulus_presentations table

[matchings]

In the stimulus_presentations table of the behavior_ophys_experiment_dataset class (AllenSDK 2.12.12), there are columns called start_frame, stop_frame and start_time, end_time. I propose renaming stop_frame to end_frame for consistency.

This would impact NWB files and therefore should be part of a larger scope of work to make improvements & updates, and is not a priority on its own.

[aamster]

@matchings currently it is start_time, stop_time, start_frame, end_frame. Do you want to rename stop_time to end_time or end_frame to stop_frame?

[aamster]

I'm going with renaming stop_time to end_time