Add line drawing characters to ptree(1)

Review Request #2429 - Created Oct. 31, 2019 and submitted

Information
Jason King
illumos-gate
11906
Reviewers
general

As the summary says, adds the optional use of line drawing characters when printing a process tree (as well as a number of simplifications and cleanup to the existing code).

Built binary, ran it without options, with -g (in C and en_US.UTF-8 locales), with -c option, and output was as expected.

Jason King
Andy Fiddaman
Jason King
Review request changed

Status: Closed (submitted)

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