MSdata_to_MA: Convert MSdata object to MetaboAnalyst object
In flajole/MSdata: Mass-spectrometry data analysis package

Create an object for storing data for processing in MetaboAnalysis (MApckg).

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## S4 method for signature 'MSdata'
MSdata_to_MA(msdata, designType = "regular",
  facA = names(sampleData(msdata))[1], facB = NULL)

`msdata`	An object of `MSdata` class.
`designType`	`"time"` if the data is time-series data; `"regular"` otherwise. In the first case one of the arguments `facA` or `facB` have to be equal `"Time"`
`facA`	Grouping factor, one of the names of sample data columns in `msdata@sampleData`
`facB`	Optional second factor.