Add an upstream table for scan.ScanLocation

[CBroz1]

The current pipeline imports element_lab.Location and then uses this as an upstream table for scan.ScanLocation which is described as follows:

Location: Reference table for ScanLocation, specifying the brain location where this scan is acquired

This does not match the description of element_lab.Location:

location of animal housing or experimental rigs

I propose modifying scan.ScanLocation to the following:

@schema
class ScanLocation(dj.Manual):
    definition = """
    -> Scan
    ---
    -> AnatomicalLocation
    """

And adding the following to workflow_calcium_imaging.pipeline.py or element_calcium_imaging.scan, changing the schema decorator:

@lab.schema
class AnatomicalLocation(dj.Manual):
    definition = """
    scan_location_id : varchar(16)
    ----
    anatomical_description: varchar(256)
    """