Simplify manage_heater

- Make separate get_pid_output(e) and get_pid_output_bed() function
- Reduce size of manage_heater function
- Hopefully work around linker errors

Fix missing temp_error declarations

- Fix for #1591 replacing #1595

Macro indirection for stepper drivers + Support for TMC26X and L6470 Stepper Drivers

The max acceleration limiting was in wrong place.

Added option to set Travel Acceleration (non printing moves).
The M204 options was a non sense (S for printing moves and T for retract
moves).

It has been changed to:
P = Printing moves
R = Retract only (no X, Y, Z) moves
T = Travel (non
printing) moves

I will add this info o G-Code wiki in reprap.org. I also advise to put
this info in Marlin next version changelog.

I forgot to enclousure the variable with #ifdef

removed the link as the software i had did not work, nor does anyone hardly use irc chat but just hang out there

Conflicts:
	Marlin/Marlin_main.cpp
	Marlin/stepper.cpp

fix a handful of cases where strtod() was cast to int, instead of just using strtol()

fix typo in delta example config introduced in commit 697ee2d

Fix controller fan

commit 697ee2dc50

More sanity-checking for ABL

- Moved sanity-checks to Marlin_main.cpp
- Applied to other configuration files
- Fixed formatting of ABL output
- Passing verbose level to probe_pt
- Miscellaneous cleanup
- Put CONFIG_STEPPERS_TOSHIBA into Configuration.h

Make sure a ROM is selected for ULTRA_LCD

Fixes gCode handling of comments and escaped characters

Fix compile error in gcode_G29

- A redo of #1576, which missed topo_flag
- Always set verbose_level

Minor typos in the README

Undubble MSG_MIN & MSG MAX

add ```^ !(n_ENABLE_ON)``` for each stepper

In-line comments and escaping fixed by foosel

  * "G1 X1 ; test" was not executing "G1 X1" due to never leaving comment mode.
  * "M117 Hello \;)" printed "Hello \" to the display due to not replacing serial_char properly.

Tested with the following commands:
    * M117 Hello ; test => displays "Hello" on display, ignores "test"
    * G1 X1 ; foo => moves 1mm in X, ignores "foo"
    * ; test => completely ignored, not even acknowledged
    * M117 Hello \;) => displays "Hello ;)" on display
    * M117 Hello \\;) => displays "Hello \" on display, ignores ")"

dev pull

Gcode handlers to inline functions

Enhanced G29

Latest upstream changes

Fix autoretract

Autoretract was broken, looks like it was overlooked when the retracted flag was updated for multi extruders.