Minor/final tweaks based on user feedback

Nearly ready for first production deployment:
-Fixed a bug with 00 and 12 hour times where they showed up as 1 in hour selector
-Editing an hours entry now fills in the end time (instead of the current time)
-Switched hours edit/delete buttons to use text links
 This allows the table to be copy/pasted to Excel easily for filtering/editing
 with text links, the links remain clickable even from the spreadsheet
 (A tool/approach used by the volunteer coordinator giving me feedback)