Set flow rate (extrude-mutliplier) for each extruder individually

Extension of M221, Tune menu

Update on 140315

Add support for disabling encoder control for feedrate multiplier

Added CHDK support

Firmware retraction now stores the retract and recover speeds in mm/s
instead of mm/min. This makes it match the units of the maximum
feedrate, and fixes problems with modifying the value via LCD control
panel. From gcode, the values are still taken in mm/min to match the
units of G1 and similar, and they are converted to mm/s before they are
stored.

I also lowered the default retract feedrate to make it less likely to
cause problems for geared extruders when the user hasn’t bothered to
set a reasonable maximum feedrate, though users should be setting both
of these values to suit their hardware.

Signed-off-by: Matthew Schick <matthew.schick@gmail.com>

Added CHDK support to take pictures instead of doing an IR command, see more about how to use it here http://captain-slow.dk/2014/03/09/3d-printing-timelapses/

Added so M240 can be used to trigger CHDK instead of sending an IR signal, see more about CHDK here http://captain-slow.dk/2014/03/09/3d-printing-timelapses/

Increase Z_HOME_RETRACT_MM to 2mm default to avoid end stop not switching during retract.

Fixed Finnish translation

- Fixed Few finnish transalations
- Removed duplicate contrast define

temperature.cpp: Fix PID_DEBUG compile error.

Update README.md with Autotemp typo fix

Add M665 to dynamically set delta configuration

Conflicts:
	Marlin/Marlin_main.cpp

Various typo fixes #5 - only in comments, no code changes.

Various typo fixes #4 - only in comments, no code changes.

autretract fix

Clarify which PID values to enter

Update menu plan

Fixed typo.

Various typo fixes #3 - only in comments, no code changes.

I made these changes previously, but I can’t find the commit now. This
reapplies the changes to get auto retract working again.

Conflicts:
	Marlin/Configuration_adv.h
	Marlin/Marlin_main.cpp

Updated gen3+ board pins names to current convention

Users can be confused as to which values to enter after a PID tune. Updating the message to help clarity it.
New message: "PID Autotune finished! Put the last Kp, Ki and Kd constants from above into Configuration.h"

Old message: "PID Autotune finished! Put the Kp, Ki and Kd constants into Configuration.h"

Auto bed leveling at arbitrary points

Fixed compiler errors on Ubuntu using arduino-core

Use constants instead of numeric literals

Prevent G29 without first homing in X and Y