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.tex files from help.loncapa.org largely done. Added some lables to
older files. Last mega-massive .tex commit for a while.

\label{Spreadsheet_Completely_Recalc}
The total number of sheets in course can be tremendous, since it is
the number of students times the number of assessments. LON-CAPA
caches these sheets and only selectively invalidates those cache
copies if potentially relevant data changes. \textbf{Completely
Recalc} forces LON-CAPA to invalidate all cache copies.

For instance, this is necessary to get the most up-to-date
calculations if the sheet itself contains direct access to the system
clock (making it ``out-of-date'' the moment it is calculated), or if
an assessment is edited in a way that would retroactively change
grading. The automatic spreadsheet invalidation catches student
submissions, \textbf{PAR}a\textbf{M}eter changes, and spreadsheet
changes, but not re-publication of a problem resource.