toolhead: Eliminate set_max_jerk() from kinematic classes

Allow the kinematic classes to query the max velocity, max accel, and
max halt velocity from the toolhead class instead of having the
toolhead class call into the kinematic classes with those values.

Signed-off-by: Kevin O'Connor <kevin@koconnor.net>

klippy/klippy.py

@@ -6,7 +6,7 @@
 # This file may be distributed under the terms of the GNU GPLv3 license.
 import sys, optparse, ConfigParser, logging, time, threading
 import util, reactor, queuelogger, msgproto, gcode
-import pins, mcu, chipmisc, extruder, fan, heater, toolhead
+import pins, mcu, chipmisc, toolhead, extruder, fan, heater
 
 message_ready = "Printer is ready"
 
@@ -172,7 +172,7 @@ class Printer:
             ConfigLogger(self.fileconfig, self.bglogger)
         # Create printer components
         config = ConfigWrapper(self, 'printer')
-        for m in [pins, mcu, chipmisc, extruder, fan, heater, toolhead]:
+        for m in [pins, mcu, chipmisc, toolhead, extruder, fan, heater]:
             m.add_printer_objects(self, config)
         self.mcu = self.objects['mcu']
         # Validate that there are no undefined parameters in the config file