Smooth X-axis for Zonestar P802M

I have redesign the belt tensioner and its idler to suit 625zz bearing and longer 8mm rods which come with Zonestar prusa. I also added some holes in motor mount and idler to fix the rods better via nuts. X-carriage is from Prusa rework package, I have not modified it.

Be aware! This kit uses standard distance between rods, Zonestar distance is ~1mm smaller. This means that you will have to drill some extra holes in the metal plate to mount Zonestar carriage onto standard prusa carriage or