Add Panelolu2 support for Melzi
Merge pull request #485 from Banjer/Panelolu2_Melzi

Add Panelolu2 support for Melzi
fixed typo / added "const" to defines for newer gcc compatibility
Merge branch 'Marlin_v1' of https://github.com/ErikZalm/Marlin into Marlin_v1
Merge pull request #488 from MStohn/fix-typo

fixed typo / added "const" to defines for newer gcc compatibility
Merge branch 'Marlin_v1' of https://github.com/ErikZalm/Marlin into Marlin_v1

Conflicts:
	Marlin/dogm_lcd_implementation.h
just some style updates