* doc/ref/misc-modules.texi, doc/sources/unix.texi, module/ice-9/ftw.scm: Replace "filesystem" by "file system".
(Not quite finished, the following will be done tomorrow. module/srfi/*.scm module/rnrs/*.scm module/scripts/*.scm testsuite/*.scm guile-readline/* )
Moved ice-9/ and oop/ under module/, with the idea being that we have only scheme under module/. Adjusted configure.in and Makefile.am appropriately. Put oop/ at the end of the compilation order.