MEA objectsThis constructor function checks if all the supplied MEA objects share the same sampling rate, pre-processing, and metadata,
and returns an object with additional attributes summarizing the contained MEA objects.
MEAlist(listOfMea)is.MEAlist(x)
a list containing MEA objects
object to be tested.
an object of class MEAlist
is.MEAlist returns TRUE if and only if its argument is of class MEAlist