yuni r6rs: Add r6rs version of syntax-inject syntax
yuni: Extend (yuni base shorten)
build-nmosh: Ignore unknown library file
buildstub: Add R6RS-common library group
Racket: Add run/plt-r6rs.sh

Just for me :)
yuni r6rs: Change API syntax-inject => define-inject-syntax

er-macro-transformer and legacy macro system cannot handle syntax-inject
(Return unhygenic macro transformer as let-syntax'wise transformer)
yuni chibi: Add define-inject-syntax
doc: Add HACKING file
gauche: Add macro-primitives (INCOMPLETE)