`DISTRIBUTION, CUTOFFPZ = 0` does not imply cutoff infinity and produces infinite loop

Summary

The documentation of DISTRIBUTION, CUTOFFPZ = 0 mentions an infinity cutoff, but this is currently not true.

Steps to reproduce

set DISTRIBUTION, CUTOFFPZ = 0

What is the current bug behavior?

Infinite loop

What is the expected correct behavior?

According to the manual CUTOFFPZ:

Defines cutoff in p_{z} dimension in units of \sigma_{pz}. If CUTOFFPZ = 0 then actual cutoff is p_{z} is set to infinity.

Possible fixes

The following line in Distribution.cpp should be changed for cutoffP_m[2] in a similar way as x and y:

            allow = (xAndYOk && pxAndPyOk && std::abs(z) < cutoffR_m[2] && std::abs(pz) < cutoffP_m[2]);

Varia

For consistency I propose also to make CUTOFFLONG=0 an infinite cutoff.