improve the data frame returned by getDataForAllScenarios

[rabutler]

Two overall ideas:

1. make the columns as similar to the csv from RiverSMART/RiverWare as possible
2. store more information about the original data

For 1.

• this relates to #30, but need to recognize that the csv from RiverSMART will be passed to one of the summarize functions, and the output of that function is analogous to the output of getDataForAllScenarios

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  All handled in data returned by rw_scen_aggregate() For 2:

• store the slot agg list as an attribute, or some way to keep track of how slots were summarized

• maintain original folder name, and scenario name

• maintain original slot name, and variable name

[rabutler]

• Scenario or ScenarioName should always contain the full scenario names
• ~~then, have another variable: ScenShort or similar, which contains a shortened scenario name that is easier to use in the code~~
• same idea with variable

in a 1 million row tbl fromgetDataForAllScens(), adding a second character column adds 25% onto the size of the tbl; same is true for one with ~500,000 rows. The above data are stored as attributes and we will provide lookup of either the original slot name or the original scenario folder

• [x] rwtbl_get_scen_folder()
• [x] rwtbl_var_to_slot()

[rabutler]

For rdf files, Scenario has to be created from R with dimensions provided to it. The dimensions have to be pasted in the same order as they are in RiverSMART for the Scenario's to match exactly.

[rabutler]

Will not update data frame returned by getDataForAllScens(), since it is being replaced by rw_scen_aggregate()