getMostRecentWindowEntries() is a mix of UI & logical code

[tjk213]

getMostRecentWindowEntries() retrieves the data for the last entry in each Rolling-ROI sheet. This is used to generate a table in the summary email that looks like this:

Last 4 years:	195.69%	(2.96X)
     3 years:	141.66%	(2.42X)
     2 years:	81.94%	(1.82X)
     1 years:	-52.60%	(0.47X)

The choice to only put the word last on the first line is a UI design decision, and should therefore live in a UI codeblock (e.g., in the HTML file), not in getMostRecentWindowEntries(). getMostRecentWindowEntries() should not need a special codepath for this - it should simply return the data.