io provides qread for reading in data of various types
and qwrite for writing data to files of various types.
Input or output file types can be inferred from filename extensions or
specified explicity.
Use link{io_supported} to check wehather a data or file type is
supported.
Both qread and qwrite can be readily extended
to support additional types by defining specific S3 methods.
Additionally, qdraw offers a unified interface for plotting
to screen or various file formats.
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