DECODR1412.EXE Chl Blank, F, Tau from user-entry working

Two problems fixed:

Problem 1:  when updating .csv with CHL values - values placed in the boxen for Blank, F and Tau uses blank values for everything resulting in 0.00 in all fields for Chl in sta.csv files. Solution - F & Tau array elements were not index properly so Blank was used for all three values - fixed.

Problem 2: recurrent "no .bak directory" error message when trying to update sta.csvs for Nuts.  Solution: when there is an error, this is the default response even though the error may be the result of something else. Error descriptor has been updated to describe other problems.