* libc/ioman.c: Moved to libfs.
* libc/Makefile.am: Removed ioman.c as part of moving it to libfs.
* libc/base_fs.c: Removed include of imfs.h and reworded comment
to avoid being IMFS specific.
* libc/libio.h: Removed prototype of IMFS_ops since it should
not be in this file.
* libc/mount.c: Removed IMFS specific configuration information.
* libc/unmount.c: Removed include of imfs.h and reworded comment
to avoid being IMFS specific.
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