get_latest_output_date_index: get the latest index for given an output dir and a date
Description
directories are assumed to be named in YYYY_MM_DD.VV format with sane
year/month/date/version values.
Usage
get_latest_output_date_index(dir, date)
Value
[int] largest version in directory tree or 0 if there are no version OR
the directory tree does not exist
Arguments
- dir
[chr] path to directory with versioned dirs
- date
[chr] character in YYYY_MM_DD format