The script create_merge_dates_ann.py creates the SMOKE "merge dates" files
that are used by the Mrggrid script, and the annual report script (post-Smkmerge).

To use this script: 
> create_merge_dates_ann.py YYYY
where YYYY = four-digit year.

To use your new merge dates files in your SMOKE run script:
setenv MRGDATE_FILES "/full/path/to/one/of/your/files/smk_merge_dates_201101.txt"

This script uses the HOLIDAYS file included in this package.
Note - this HOLIDAYS file only goes up through 2017.

The columns in the merge dates files coorespond to different representative day
settings:
"aveday" = one rep day per month
"mwdss" = four rep days per month: Monday, Weekday (Tue-Fri), Saturday, Sunday
"week" = seven rep days per month: one for each day of the week
"all" = no rep days; each day is processed individually
The "Y" or "N" following the rep day setting indicates whether holidays are processed
separately, using Sunday temporal profiles, in addition to the representative days.
