#438 F-word incorrectly affects treading (G33/G76)

[skunkwork]

Under certain circumstances the f word seems to effect threading.

http://www.linuxcnc.org/index.php/english/forum/20-g-code/29685-g76-pause-in-z-during-exit-taper-linux-cnc-270

Jeff Epler made a config that shows it.

http://emergent.unpythonic.net/files/sandbox/0001-config-and-ngc-to-reproduce-bug-report-by-verticalpe.patch

It seems that setting F0 before the g33/g76 elevates the oddness.

Some conversation on irc
http://tom-itx.no-ip.biz:81/~tom-itx/irc/logs/%23linuxcnc-devel/2015-09-27.html