This function collates AEMO data files that are on the path. These
are identified by having a filename of the form
[REGION][YYYY][MM].csv (e.g. "NSW201405.csv"). If no such
file exists on path, all available data files are downloaded from the
AEMO website using get_aemo_data().
a string containing the location of the AEMO (CSV) data files
that you wish to collate. These must have filenames of the form specified
above.
remove_files
a boolean flag indicating whether the AEMO CSV files
should be removed once the data sets are collated.
Value
a data frame containing five fields: "REGION" (factor),
"SETTLEMENTDATE" (POSIXct), "TOTALDEMAND" (numeric),
"RRP" (numeric) and "PERIODTYPE" (factor).