Make Telescope be an attribute of UVData, UVCal, UVFlag to carry the telescope attributes

[bhazelton]

Potential things:

• antenna positions (already on Telescope)
• antenna system temperatures
• primary beam pointing errors
• weather (might be just per site or maybe per antenna)
• associated UVBeam object (or filename)
• bulk delays (e.g. cable delays, correlator delays)
• UVCal object optionally associated

Note: the term telescope is potentially confusing. Karto thinks of telescope as meaning one antenna, I think of it as meaning the array. Maybe we should move to "Array" terminology.

[bhazelton]

Plan is to make the current Telescope object be an attribute on UVData, UVCal, and UVFlag with the existing related attributes on those objects aliased to the matching Telescope attribute.

New info can be added later directly to the Telescope object.