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Add pargs, penv, pwdx commands and aliases to procstat(1).

Description

Add pargs, penv, pwdx commands and aliases to procstat(1).

Intent is to mimic Solaris commands with the same names.

Submitted by: Juraj Lutter <juraj@lutter.sk>
MFC after: 1 week
Differential revision: https://reviews.freebsd.org/D26310