Update survey strata with information provided by Merrill.

Survey strata are specific to species and must be changed from
the original code which was specific to petrale. Merrill read
the stock assessment document and got the information we needed
to make the appropriate strata. This should help with model
convergence and also matching the old assessment documents.
Add helpful comments to surveyindex code

Did not change any functionality only added comments so that the
next user will be able to read the file without assistance.
Need to update the r forge code still.
Create code to install nwfsc package from r forge
Minor tweak to loading downloaded package
fix error in YEAR
update main file