GpmapMerpar: Work with vector files for plotting maps
Description
GpmapMerpar creates a data file with meridians or 
	parallels
Gpmapsr2gnu saves the lines and points from a maps object to a data 
file readable by gnuplotUsage
GpmapMerpar(parfile='worldpar.dat',merfile='worldmer.dat',pardeg=10,
	merdeg=10,splot=FALSE)
Gpmapsr2gnu(mapsObj,mapFileName)
Arguments
parfile
 output file with parallels
merfile
 output file with meridians
pardeg
 resolution is degrees for parallels
merdeg
 resolution is degrees for meridians
splot
 boolean, TRUE=output for splot
mapsObj
 object of type maps
mapFileName
 output data file name