codex.tst snarf uuencode tests, add { rot13 iconv }

recode uuencode to use -lcodex: meth->data may be exported by <uu.h>

recode iconv to use -lcodex

code-zip combine { code-huff code-explode code-inflate }

code-pzip pzip[:partition-file-path]

code-bzip pzip[:partition-file-path]

code-compress

code-bx snarf from libuu