Make column names capitalization consistent

[fedorov]

As much as possible, it would be helpful if the names of the columns in the auxiliary table were capitalized consistently.

Currently, all DICOM attributes in dicom_metadata follow CamelCase convention, while most of the columns in the aux table are all lower caps with underscore separator.

Since for most users the primary table will be dicom_all, which is a mix of DICOM and non-DICOM items, it would be very convenient to be able to easily differentiate between those two groups.

The following are exceptions to the capitalization convention in the aux table are the following attributes:

• LicenseURL
• LicenseLongName
• LicenseShortName
• capitalization of source_DOI is changed in the view query: aux.source_doi as Source_DOI,

Collection-level tables also use CameCase, but since neither of those attributes is coming from DICOM, and they are not included in dicom_all, this is less consequential, although maybe we should consider making it lower case to be consistent with the aux table.