Add CPT Descriptions Table

[kindofluke]

Adding a CPT View to UMLS Flow

CPT codes are everywhere in a lot of healthcare datasets. A little while ago, they were added to UMLS giving a range of descriptions of for those codes that are very helpful.

I followed the approach that is used in the RXNORM database to create a table that contained the cpt descriptions in all its forms.

The resultant table takes the following form:

Column	Description
code	The CPT Code
short_desc	AMA Supplied short description based on AB
consumer_desc	AMA description for printing on consumer facing applications based on ETCF
clinician_desc	Clinician description based on ETCLIN
medium_desc	based on SY
full_desc	based on PT

the documentation on the CPT source that defines these terms is at Metathesaurus Representation

[kindofluke]

I should also say that I am sorry for the messy commit history. I was going to be doing a project with MRREL umls table but ended up not doing it and reverting those changes.