Consider negative Z Offsets when auto bed leveling is active

Fixed BABYSTEPPING feature

Fixes #1069.  Added "auto fan" checks to PID_autotune.

 temperature.cpp: Add Conditional Integration to prevent excessive integral windup

Move initialization of errormagic[] and echomagic[] to Marlin_main.cpp

LCD Progress Bar

Current defaults are all 255.  If it makes sense to reduce them, they should come down together, and
be in a  PID_INTEGRAL_DRIVE_MAX <= PID_MAX <- BANG_MAX relationship.

getting even with v1

Moved PSTR() macro to correct place which was causing the " initializer fails to determine size of '__c' " when attempting to compile with BABYSTEPPING enabled.

Clarification and markdown for boelle notes

Merge pull request #1213 from ErikZalm/Marlin_v1

Merge pull request #1214 from ErikZalm/Marlin_v1

added note about stale branches

added note about stale branches

Revert "Change Auto_Bed_Leveling to Auto_Bed_Compensation"

Use SdFatUtil::FreeRam() for freeMemory() if there

Split do_blocking_move() to XY and Z sections

Fix syntax errors in #ifdef

Change Auto_Bed_Leveling to Auto_Bed_Compensation

Changed level to compensation

Changed leveling to compensation

Changed level and leveling to compensation.

Changed level and leveling to compensation

Changed level and leveling to compensation (except with "verbose_level" and "lcd_reset_alert_level").

Changed AUTO_BED_LEVELING to AUTO_BED_COMPENSATION

Changed AUTO_BED_LEVELING to AUTO_BED_COMPENSATION

Changed AUTO_BED_LEVEL to AUTO_BED_COMPENSATION

Changed AUTO_BED_LEVEL to AUTO_BED_COMPENSATION

Changed Auto Bed Level to Auto Bed Compensation

Changed "Bed Auto Level" (and variants) to "Auto Bed Compensation".

Fixes commands not being acknowledged in the same order they are received in

in

G0 to G3 were previously acknowledged in the get_command method, causing
them to be possibly acknowledged before commands coming after them that
were acknowledged in process_commands.

This patch fixes this, moving the acknowledgement of G0 to G3 to the
process_commands method as well. These commands are therefore no
longer acknowledged when the enter the cmd_buffer but instead only
acknowledged when the enter the plan_buffer.

Guaranteeing that commands are acknowledged in the same order in which
they were received by the firmware allows host software to be able to
track the life cycle of commands and such a better management of the
firmware's serial buffers as well as better internal command processing
and response parsing without having to depend on throwing an epic
amount of regular expressions against each line received back from the
firmware.

Fixes ErikZalm/Marlin#1147

Conflicts:
	Marlin/cardreader.cpp
	Marlin/cardreader.h