WriteNSM: Write named sparse matrix
In aultsch/DataIO: IO Handling for Files Containing Data

Saves a named sparese matrix to disk using ".NSMrow.names", ".NSMcol.names" and ".NSMmat.lrn"

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WriteNSM(FilenameWithoutExt, Matrix, LineKey, LineHeader,

 ColumnKey, ColumnHeader, OutDirectory, Comments)

`FilenameWithoutExt`	Filename for the saved matrix without extension
`Matrix`	The sparse matrix. Must be a sparse matrix from the Matrix package
`LineKey`	Optional: Vector of keys for all rows. Defaults to the vector `1:n` for a number of lines `n`
`LineHeader`	Optional: Vector of strings. Names for all rows. Defaults to: `paste0("R",LineKey)`
`ColumnKey`	Optional: Vector of keys for all colums. If not given and matrix dimensions are eqal, LineKey is taken as ColumnKey. Otherwise defaults to the vector `1:n` for a number of lines `n`
`ColumnHeader`	Optional: Vector of strings. Names for all columns. If not given and matrix dimensions are eqal, LineHeader is taken as Columnheader. Otherweise defaults to `paste0("C",LineKey)`
`OutDirectory`	Directory where the files should be saved
`Comments`	String containing comments for the sparse matrix