| This routine displays a box according to the coordinates passed to it via the COMMON area variable Param.
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 Remarks
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| Param must be in the following format:
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| · | TLR.TLC svm BLR.BLC…
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| · | Where svm is a sub-value mark (CHAR (252))
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| · | TLR is the top left row for the box
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| · | TLC is the top left column for the box
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| · | BRR is the bottom right row for the box
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| · | BRC is the bottom right column for the box
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| There can be as many sequences, for multiple boxes, separated by svm's (sub-value marks CHAR (252)). The resulting boxes will join with the correct line drawing character i.e. a left-T, right-T, top-T, bottom-T or an intersect character.
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| In addition, if there is a positive numeric value in multi-value position 4 of Param, the box will be cleared (and the fill colour is determined by the number in mv 4 depending upon how the colours are set-up in the terminal definition).
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 An alternative routine is also supplied that does not use the common area to pass data but fields are defined within the CALL statement. See the next routine MV.PRINT.BOX.
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