Moved the PID_dT in the Ki and Kd calculation from the configuration.h to temperature.cpp

For upstream

Fix compilation error when PIDTEMP is undefined and ULTIPANEL is defined...

Open Hardware board currently used by the group build of http://tvrrug.org.uk
The board can be found at http://solderpad.com/folknology/open-motion-controller/

Signed-off-by: Michel Pollet <buserror@gmail.com>

+ Removed most explicit pathnames, use the standard make "VPATH" to let
make find the files for itself.

+ Added a "hardware variant" variable that allows compiging Sanguino and
Gen7 as well as "generic" arduino.

+ Allows overriding the MOTHERBOARD define from the Makefile

+ Removed the 'preprocessor' bit that wasn't needed, now just "include" the
files that are needed, since it allows gcc to show the right file/line
when displaying error/warnings.

+ Uses gcc's own dependency generator to generate the .d files, and
and include these instead of self-patching the makefile

Signed-off-by: Michel Pollet <buserror@gmail.com>

One array was too short. This had nothing to do with long filenames, other than if they were 12 characters exactly, which could only happen if the extension and the text before were filled completely

Better pin configuration for rotary encoder in RAMPS boards

Make F_CPU dependence of stepper.cpp more explicit

M303 Starts autotune. Wait till the Kp Ki and Kd constants are printed.
Put these values in Configuration.h

While Waiting for hotbed to warm up via M190, LCD Display and Click Enco...

This simplifies wiring for those with RAMPS 1.3 and 1.4 boards.

Translation still needed.

make analog2tempBed return a precise celsius reading for BED_USES_THERMISTOR, ...

Made plan_buffer_line arguments const...

The percent complete now lines up with the temperatures and Z-axis position figures, nicer to read and nicer to look at IMHO.

Instead of adding a momentary switch to fake the insertion of the card I have modified the ultralcd menu item:

Card Menu -> Refresh

to reinitialise the card providing that the SDCARDDETECT pin has been set to -1 in the pins.h file.  This requires one less switch on the front panel and the refresh menu item is in the most relevent place for a user who wishes to inert a card and then print from it.

It also means that the "Card inserted" messages do not bother the users of these card readers (they dont make sense for users without SCCARDDETECT)