Add Threads display with -T option

[joknarf]

• detect ps available -o options in bash section
• detect args/comm in bash section
• now uses bsd ps ax instead of ps -e
• -T option to display threads

[codecov-commenter]

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Codecov Report

Attention: Patch coverage is 84.00000% with 12 lines in your changes missing coverage. Please review.

Project coverage is 93.61%. Comparing base (c1ab547) to head (30034b3).
Report is 1 commits behind head on master.

Files	Patch %	Lines
pgtree/pgtree.py	80.64%	12 Missing ⚠️

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Additional details and impacted files

@@            Coverage Diff             @@
##           master      #17      +/-   ##
==========================================
- Coverage   94.65%   93.61%   -1.04%     
==========================================
  Files           3        3              
  Lines         374      423      +49     
==========================================
+ Hits          354      396      +42     
- Misses         20       27       +7     

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