Merge pull request #82 from phord/fix-gen7-build

pins.h: Define Z_MAX_PIN for Gen7 board
Merge pull request #83 from phord/tempfix

Add explicit #define for bogus temp override
Merge pull request #81 from phord/09469add5560ca8a676c42e4bcd499868c33f0dd

Clean up and add some trace info
Fixed homing
remove stop_heating_wait
Fixed HOME_POS in combination with G28 X0 or G28 Y0
Made plan_buffer_line arguments const, which optimizes better and fixes the RUNOUT_PREVENTION feature.
Merge branch 'Marlin_v1' of git://github.com/ErikZalm/Marlin into Marlin_v1
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Merge remote-tracking branch 'upstream/Marlin_v1' into Marlin_v1
Fixed general 16x2 LCD build without SD support.
Only protect the heater pins for the defined extruders.
Changed the way the extruder pins are defined so it doesn't create extra -1 entries in the list.
Typo fix
fixed languages; Preheat_PLA and Preheat_ABS was not defined for non
english
added german translation;Menue should be in english.. sounds better
fixed LCD manual z axis move Feedrate to 70 (was 1700)
added M31 - delete file from sd card
make analog2tempBed return a precise celsius reading for BED_USES_THERMISTOR, complementing changes to analog2temp in d15f01e
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.
This is in my opinion a much better way of dealing with SD cards than my previous fix.

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)