Update of outputSGP man page
Update of man page for createKnotsBoundaries
Updating documentation for growth and achievement plots
Update of bubblePlot man page
Update of documentation for testSGP to include testSGP(3) and testSGP(4)
Man page corrections for splineMatrix-class
Spelling corrections in README.md
Corrected NEWS
Merge pull request #521 from dbetebenner/master

Update of various man pages