initial commit - FiberInsertions and other related tables - draft

[grg2rsr]

Proposed changes for representing photometry / fiber based experiments in alyx, including

• FiberModel -> modeled after ProbeModel
• FiberInsertion -> modeled after ProbeInsertion
• ChronicFiberInsertion -> modeled after ChronicInsertion
• FiberTrajectoryEstimate -> modeled after TrajectoryEstimate
• FiberTipLocation -> modeled after Channel

main differences:

• Fibers don't have identifiable identities such as probes
• Fibers have a set of unique parameters such as diameter, NA, tip shape etc
• FiberInsertions are always chronic, but the FiberInsertion / FiberChronicInsertion logic is kept for consistency to ephys probes
• FiberTrajectories are not ephys aligned
• A fiber has a single "channel" which is modeled by a FiberTipLocation

Not present yes:
Serializers / Views