Merge pull request fawda123#15 from swmpkim/SplitFunctions

Split functions

version update to 2.3.1 to fix concept tags, added CITATATION, NEWS u…

…pdates

2.3.0 uploaded to cran

url descrip for swmp to description file

option for points on overplot

removed final wq link

parser now uses xmlTreeParse

fixed case issue for import_local

news update for 2.1.3

default method for smoother, aggremetab now can use moving window ave…

… with changes in plot_metab