Made changes to help doc for batchFetchCorrProps and ...CorrPairs
added by region.location type for batchFetchCorrProps

* added printing of table, made into function
* made getCorrMetrics into function
* copied these functions into fetchCorrPairs for cleaner code
Added batchFetchCorrPairs.m that outputs table of correlated cellPairs and their pvalues

* myPlotCorrGraphImage-- removed 4 loop and simplified unused distAll
* fprint outside for loop for batchFetchCorrPairs, elapsed time of
21.918719 seconds with 8750 pairs
Moved print to table to append to file on each iteration. Faster algorithm.

Elapsed time inside for loop for reshaping output and fprintf is
10.405333 seconds for 8750 pairs (half of time of reshaping array and
writing to disk all at same time outside of for loop).
Edited and corrected fetchCorrPairs_doc.md manual