fixed 'makeInputForExperimentalDesign'; generalized experimental design

- fixed 'makeInputForExperimentalDesign' & !makeOutputDB: parsing of
the files was incorrect if separator was already used by text; added a
(hopefully) unique 'ExpInput_Seperator'
- generalized experimental design: structure of
'datafile.Experimentals' does no longer need to be a copy of the
structure of 'datafile.treatments'; currently, experimental design
could now cover any changes to sw_input_treatments, sw_input_site, and
sw_input_soils
- added file with R code that makes hand-run testing simpler