Enhance opstream by allowing output to a specified ostream.

[KineticTheory]

Background

• While debugging an out-of-order print issue, we needed this minor enhancement of opstream.

Description of changes

• Extend the capabilities of opstream by allowing output to be directed to any std::ostream instead of forcing output to std::cout. If the output stream is not specified, it will default to the previous behavior of std::cout.
• Provide const attribute for some arguments of functions provided in dbc.hh.
• This PR also serves as a sanity check for the new git pre-commit-copyright hook, Provide git-hook that updates copyright block automagically. #1105.

Status

• Reference:
  • Pre-Merge Code Review
  • CDash Status
• Checks
  • Travis/Appveyor CI checks pass
  • Code coverage does not decrease
  • Valgrind test passes
  • Toss3 checks pass
  • Trinitite checks pass
  • Code reviewed/approved, sufficient DbC checks, testing, documentation

[codecov]

Codecov Report

Merging #1106 (c9799e0) into develop (f23bf69) will not change coverage.
The diff coverage is 100.0%.

@@           Coverage Diff           @@
##           develop   #1106   +/-   ##
=======================================
  Coverage     88.7%   88.7%           
=======================================
  Files          374     374           
  Lines        18593   18593           
=======================================
  Hits         16497   16497           
  Misses        2096    2096           

[keadyk]

LGTM!