Add separate rtout frequency to hydro.namelist options

[aubreyd]

New feature request:
We have an internal rtout_factor in HYDRO_drv/module_HYDRO_drv.F that, for io_config_outputs=5, decreases the write frequency of RTOUT files. This is intended to save output file space for long runs, but is currently a bit of a hack and requires code changes to alter. The proper way to do this is really to add a separate write frequency in hydro.namelist for RTOUTs. In more general terms, could separate output frequency for 1d (smaller) vs. 2d (larger), or even add manual write frequency settings for each output file options.

[jmccreight]

This again for HYDRO_RST. In the AnA, the only meaningful one (AFAIK) is the first one, yet we write all of them. This would save a tremendous amount of time in the cycle if it only wrote the first one.

[jmccreight]

Tough, if it were simply a frequency, then it would not be enough. A frequency and a first hour of output would be good. Or just a list of seconds.minutes after which to output.