Marlin 2.0.0.bugfix for GT 2560 (Geeetech, CTC and more...)

**Español a bajo**

Hello, update of 07 Jun 2019
Here you have a new build for Gt2560. I have not been able to test it thoroughly due to a hardware problem of my printer, anyway it works well.
I leave in this page also beta4, which is the previous one so that you can go back in the case you do not work well beta6


31-03-2019 New!
Added the manual leveling of the bed.
Now from the menu you can level the hot bed to your liking even if your printer does not have the level sensor for the Z