Create 'workflow' for Rainmaker in a vignette

[limnoliver]

Create a start-to-finish workflow vignette to walk through all of the functions in Rainmaker.

[limnoliver]

Important things to include:

1. Starting from different file inputs - e.g., whether they are directly from dataRetrieval, aquarius, etc
2. Extensive documentation for dates. A common trip up for Todd: When exporting from Aquarius or GCLAS, there is an option to open in Excel. If you save after you open in Excel, the dates are transformed into excel dates (which is date.type = 1 in RMprep). If you don't open in Excel, the dates are in the correct format and don't need any transformation. Though, Todd noted that you could use date.type = 2 in RMprep and it will still output pdate with the right answer.

[rbcarvin]

#11 and #12 mention making it clear in the vignette how to denote a timezone that doesn't observe daylight savings (ie "ETC/GMT+6").