Append a sequence of data frames with non-overlapping values. The operation takes the union of columns and rows of the source data frames and then unions the values. An exception is thrown when both data frames define value for a column/row location, but the operation succeeds if one all frames but one has a missing value at the location. Note that the rows are *not* automatically reindexed to avoid overlaps. This means that when a frame has rows indexed with ordinal numbers, you may need to explicitly reindex the row keys before calling append. [category:Joining, merging and zipping]

public static Frame<R, C> MergeAll<R, C>(
	IEnumerable<Frame<R, C>> frames
)