QC modifications

[wwieder]

Do we need tighter quality control for data generated by homog script to avoid subsequent analysis issues?

• non-decimal degrees in lat-lon

• strings and weird characters

• force numerical data types where expected

[piersond]

Using keykey min max table from @wwieder, add QC step to homogenization (after unit conversion--> probably at the end of homog, before upload to GDrive) to check for appropriate values in keykey & raw data.

[srearl]

ready to test on use-key-v2 branch