Changes in version 1.2.0                        

    o   Added support for counting dual barcodes via
	countDualBarcodes().

    o   Refactored countSingleBarcodes() to support arbitrary numbers
	of substitutions, insertions and deletions.

    o   Simplified countComboBarcodes() at the expense of dropping
	support for edits inside variable regions.

                        Changes in version 1.0.0                        

    o   New package screenCounter, containing the barcode counting
	utilities previously in gp.sa.screen.