Validation for the facility codes

[philmain28]

Added some validation checks to the facilities:

• check that facilities in the facility table are in the code_map tables
• check that satellites and main units have the same first data quarter, startdate, enddate
• check that units sharing feeds ""

[George-D-S]

I think this is worth merging but the bit about checking the names to ODS codes needs changing to a "for info" rather than something that will fail the build as there's going to be lots of differences - some of which will be correct due to how UKRR are using the codes.

[philmain28]

I think the descriptions on the NHS list isn't especially more consistent than ours. Thats without thinking about things like collisions.

[George-D-S]

Not sure I understand.

By "some of which will be correct due to how UKRR are using the codes." - I meant "some of the differences in name are because the UKRR are using a code which matches an ODS code but to describe something different".