- document previously undocumented OpenCL tune settings
- implement OpenCL platform selection through prefixing the device type with the platform id separated by a colon
- allow passing custom tune parameters though postfixing the device type with the 13 tuneable parameters separated by commas
- remove an extra clear() that would delete device properties structs an cause LAMMPS to output garbage strings

+ added examples for special cases with disks and rods for 2d, and spheres and rods for 3d,
+ corrected the definition of the cutoff distance in pair style command

Fixes the `pdf` target of the `Makefile`.