Often it can be useful to see the actual commands being run by make.
Other projects (eg, the Linux kernel) support this with a "V=1" make
parameter.  Do the same here.

Signed-off-by: Ian Jackson <ijackson@chiark.greenend.org.uk>

Move the .gitignore out of the Marlin subdirectory so it applies to
the whole tree, and add some missing patterns.

Signed-off-by: Ian Jackson <ijackson@chiark.greenend.org.uk>

Emacs by default doesn't recognise a ".pde" file as C++ source code.
Add the annotation to the top of the file to make it work.

Signed-off-by: Ian Jackson <ijackson@chiark.greenend.org.uk>

HOME_POS is now always where the endstop is and can be outside the limits.
The limits are now defined by MIN_POS and MAX_POS rather than HOME_POS and MAX_LENGTH.
The Z is axis now homed first if direction is away from the bed.

Saguinololu limit pins change from MIN to MAX according to the homing direction.

Added invert step pins to corexy code

Marlin v1

Add M401 - Wait for user to press button on LCD (with optional timeout) minor fix in M115.

Marlin v1 - BUG FIXES / CORRECTIONS

Melzi support

Fixes #153 for bad call to abs()