Add missing PROVIDE.

Use new style command substitution.

Add an _rc_subr_loaded variable, set to ":" by rc.subr. Scripts can use this
for a speedup by doing:
$_rc_subr_loaded . /etc/rc.subr

Split raidframe parity checking/rebuild out into raidframeparity, which is
called after quota so we don't end up with fsck and raidframe parity rebuild
taking forever after a crash/reboot.
While we a

Split raidframe parity checking/rebuild out into raidframeparity, which is
called after quota so we don't end up with fsck and raidframe parity rebuild
taking forever after a crash/reboot.
While we are here check for raid[0-9].conf & raid[1-9][0-9].conf not
raid[0-9].conf & raid[0-9][0-9].conf

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