tests/test-symlinks.out

contrib: add Chris Mason's stand-alone diff tool

This uses Mercurial's diff algorithm to generate unidiffs like the traditional diff tool.

adding foo
adding bomb
adding a.c
adding dir/a.o
adding dir/b.o
! a.c
! dir/a.o
! dir/b.o
? .hgignore
a.c: unsupported file type (type is fifo)
! a.c