bitget.m: Clean up function. * bitget.m: Rename output variable to "B" for "bit". Output is capitalized to indicate it could be an array. Rename internal variable "cl" to "cls" for clarity. Rewrite cumbersome "if ((n < 1)(:))" syntax using post logical test forced column conversion to "if (n(:) < 1)". Add comment to BIST test for empty input to clarify what it is testing. Re-order input validation BIST tests for clarity.

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