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...

While Waiting for hotbed to warm up via M190, LCD Display and Click Encoder input freeze until target temperature is reached.

Changed Pin Assignment for the RAMPS motherboard so that LCD and Rotary encoder are all wired to AUX-4

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 for the SD file statistic sits squint.  Changed "lcd.Setcursor (7,2);" to "lcd.Setcursor (10,2);".

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)

Added more defines to the language.h file so that nowe most of the text strings are now configured via this file.  Still got some hunting down to do to complete this task.

make analog2tempBed return a precise celsius reading for BED_USES_THERMISTOR, complementing changes to analog2temp in d15f01e1