PNG resolution and UUID changes

Changed PNG resolution to match PALS standard res (rather than system R
default) and updated UUID generation code based on
https://gist.github.com/cbare/5979354
Removed "old" versions of package functions

Removed "old" versions of package functions that Eden had modified some
time ago.
First working version of new R code

Can use ‘parallel’ package; all analyses now called through
DistributeAnalyses.R; can utilise user-defined benchmarks; report
analysis and benchmark errors through output structure; reports
(currently null) metric results in output structure; old ‘Model’ and
‘Benchmark’ functions removed from all analysis files; most command
line call-based functions removed. ‘Conserve’ and ‘EvapFrac’ analyses
still to be implemented.