use DB functions only for text output format
have user verify Save folder
verify 'Base name' for output file (Excel) or folder (text)
work on save path
deal with pre-existing file/folder
first test of writing data files, text format, column headers only
first test of writing data files, tab delimited text
implement 'UseOnlyValidNDVI'
allow window updates to occur
'Job completed' msg in progress box
begin to implement SAS output
implemented SAS output for text files
added standard deviation function to SQLite
debugging standard deviation function
error checking in Standard Deviation function, for SQLite
debugged Summary query
finish implementing Summaries, for text output
explicitly close Summary file
begin implementing Excel output
removed 'Make' button and obsolete code