Refactor Makefile dist

[phil-davis]

to be more like other app repos.

Issue #147

Note: different app repos do this make dist stuff in various different ways. Is the way that I have chosen the "current" standard, or some old way?

[phil-davis]

I set:

doc_files=AUTHORS.md CHANGELOG.md COPYING README.md

because these 4 files were distributed in the previous release tarball.

• are all 4 to be in the tarball?

[codecov[bot]]

Codecov Report

Merging #148 into master will not change coverage. The diff coverage is n/a.

@@            Coverage Diff            @@
##             master     #148   +/-   ##
=========================================
  Coverage     67.87%   67.87%           
  Complexity       67       67           
=========================================
  Files            14       14           
  Lines           277      277           
=========================================
  Hits            188      188           
  Misses           89       89

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[phil-davis]

@micbar I cherry-picked this onto release-0.6.1 branch also, so that you get the make dist for when you make the next 0.6.1 tarball.

[micbar]

@phil-davis You are my hero ;-)