Merge branch 'fs_refactor'

.gitignore

Makefile.am

configure.ac

src/common/compat.c

src/common/compat.h

src/common/util.c

src/common/util.h

src/include.am

src/lib/fdio/fdio.c

src/lib/fdio/fdio.h

src/lib/fs/.may_include

src/lib/fs/dir.c

src/lib/fs/dir.h

src/lib/fs/files.c

src/lib/fs/files.h

src/lib/fs/include.am

src/lib/fs/mmap.c

src/lib/fs/mmap.h

src/lib/fs/path.c

src/lib/fs/path.h