Add fte_total_census to utDataStoR

[andreabringhurst]

Add fte_total_census to utDataStoR to replace fte_gr_cred_hour_census and fte_ug_cred_hour_census have the new query report both ug, gr, and total fte by term and do it in only one query instead of two.

When reporting FTE it is often reported in 3 ways, undergraduate fte, graduate fte and total fte. Writing 1 query for all 3 of these requests makes the most sense and means that there are less queries to manage in utDataStoR.

[andreabringhurst]

I checked the sql that I plan to use and it matches the ushe census report for spring. It matches at the total, the undergraduate and graduate level.

[andreabringhurst]

This issue will be done as soon as the #22 Pull request is approved.