reimplement 'format' component of RT IT

[briesenberg07]

'format' is no longer an accurate name for the 3rd component of RT IDs:

UWSINOPIA:[institution]:[resource]:[format]:[user]

For some templates, such as UWSINOPIA:WAU:rdaWork:printMonograph:CAMS, it is.

In other cases, like UWSINOPIA:WAU:rdaWork:aggregating_printMonograph:CAMS, this portion of the ID serves a more general purpose. Here, for example, indicating that the template should be used to describe an aggregating work, which is necessary information for template users, but isn't a format of library resource in the same way that 'print monograph,' 'DVD,' or 'map' is.

This is a messy issue because making this change, especially if this included renaming the prop_set format element, would require changes to schema(s), stylesheets, prop_set instances, wiki docs, and probably even Python scripts.

[briesenberg07]

description or similar would be a better name for the element