Processes water quality data. This function looks at detection limit and detection
conditions to determine if a value is left censored or not. Censored values are given the qualifier
"<". The dataframe is also converted from a long to wide format.
Usage
processQWData(data)
Value
data dataframe with first column dateTime, and at least one qualifier and value columns
(subsequent qualifier/value columns could follow depending on the number of parameter codes)