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libdmtx has been added to layman overlay

As I just was in the need to create some DataMatrix based 2D barcodes I searched for a library that allows creation of this barcodes using C++. I found a library allowing to create and read such 2D barcodes called libdmtx. The library is available licensed by GPLv2.1 and further. So I added an ebuild to my layman overlay.

DataMatrix

It also provides the wrappers to use the library within Java, PHP, Python or Ruby and is useable from commandline by calling dmtxwrite to create or dmtxread to recognize 2D barcodes.