wok-next log apng2gif/receipt

age author description
2018-02-28 Aleksej Bobylev Choose between libpng16 and libpng12
2017-06-18 Aleksej Bobylev Up receipts to v2 syntax: cook_copy_files & cook_copy_folders -> copy
2017-02-15 Aleksej Bobylev Add libpng12; up libpng & apng tools.
2013-06-14 Aleksej Bobylev Add: gif2apng, apng2gif, apngasm, apngdis, apngopt, libpng+apng (latest stable libpng 1.6.2); up: optipng (0.7.4).