Modified gridding in gridCSV (and coarse gridding in plotMap.CSV) to result in dataframes/files that can be processed by xyz2grd using -F to correctly give pixel-registered image plots cetered on the gridded locations.
Correction to createPlotScript.GMT4.

Merge branch 'master' of https://github.com/wStockhausen/wtsGMT

Conflicts:
	R/createPlotScript.GMT4.R
Fixed bad results from merge.