[bugfixing] fixed a Code128 encoder bug

[dev][ean] ISSN support

upload to CTAN version v0.0.9.1 (under CTAN rules)

move costructors to the barcode abstract class

code refactoring for ga-canvas

added bearer bars to ITF barcode symbology

new concept: family encoder (EAN)

completelyu refactoring text_xspaced operation