added dictionary to convert winding head field value from unformatted to formatted
made it more clear when there are no wire-related NCRs (as opposed to if that section of the summary has just failed to generate)
same as above for the other NCR sections as well
fixed the incorrectly shown tension measurement threshold lines
fixed a bug that prevented a tension measurements action being edited if no previous tensions were recorded ... library function now calculates re-tensionings if previous version of the record contains tension measurements
renamed certain variables to make it clear that re-tensionings are done by comparing current and immediately previous versions of the action
action information page now shows re-tensioning comparison tables if such data exists in the record (related to bugfix in library function)
updated M2M tension measurements upload script and backend function for new layer template spreadsheets ... testing using basic G layer example