* aclocal/version.m4: New file.
* aclocal/rtems-top.m4: Add RTEMS_VERSIONING, replace VERSION w/
aclocal/version.m4.
* bootstrap: Use aclocal/version.m4 instead of VERSION.
* configure.ac: Use aclocal/version.m4 instead of VERSION.
* configure.ac: Add --enable-docs support. Add
RTEMS_HOST_CONFIG_SUBDIRS(doc). Remove doc/Makefile.
* Makefile.am: Add HOST_SUBDIRS to SUBDIRS. Remove doc from
hard-coded SUBDIRS.
* README.configure: Added a bit of information on this new option.