New plot command for PvalueCorrMatrix, fixed click contour bug in dxevents, added to documentation

* Got rid of the intial 'data' or '[]' empty brackets requirement from
myPlotCorrGraphImage. Check examples in fetchCorrPairs_doc.md
* Added flexible printfig command. e.g. printfig('png')
* Added new plot command, myPlotPvalueCorrMatrix.m
* Worked on fetchCorrPairs_doc.md documentation
* ~~Fix click cell contour bug for updating of traces plot in
dxevents~~ 2013-07-18 12:25:37