Added code to check source data does not have all 0's for a type for all times, and to check it was identical for each location (within a time).

Factored out R6 class definitions for Acceptance, Inits and Priors from interface.R.  Code could do with further streamlining (incorporation of sanity checking code into these classes, for example), but okay for now.

Merged debugged origin/interface into Chris's local interface branch with HaldDP_Posterior factored out.

Merge branch 'interface' of fhm-chicas-code.lancs.ac.uk:jewell/sourceR-G into interface

# Conflicts:
#	R/interface.R

Changed ddirich to calculate on log scale rather than logging after. Changed starting tuning values for r's. Fixed lambda_j_prop calculation (didn't work if lambda j not calculated first)

Fixed problem with initial starting values for q being in the wrong order. Changed update lists to a single list to remove mcmc func closures. Added names to updaters so they can be identified for the acceptance rates. Added some more help file notes. NOT WORKING CORRECTLY for sim data.

Merging my updates to branch 'interface' of fhm-chicas-code.lancs.ac.uk:jewell/sourceR-G into interface.

Added AdaptiveSingleSiteMRW updater.  Corrected a problem in AdaptiveLogDirMRW where individual components were not being able to adapt independently.