v0.1.5 added nml list arg support, pretty print function for nmls

fixed some typos in the help as well. Created some errors for flawed set variables for nml. Mainly this is an nml pull request, because I didn't like having to do things like this:
source.nml  <-	set.nml(source.nml,argName="inflow_factor",param.val)
source.nml  <-	set.nml(source.nml,argName="num_inflows",1)

instead can do:
source.nml  <-	set.nml(source.nml,argList=("inflow_factor"=param.val,"num_inflows",1))

and 
pretty.nml(source.nml)