calc 2.15.1.0 release

[lcn2]

The following are the changes in this release:

Converted all ASCII tabs to ASCII spaces using a 8 character
tab stop, for all files, except for all Makefiles (plus rpm.mk).
The command `git diff -w` reports no changes.  There is no
functionality change in calc: only ASCII tabs to ASCII spaces.

Fixed trailblank.  It was pruning . in its find search.
Added check for ASCII tabs is non-Makefiles.

This version will form the basis for the calc v2 to calc v3 fork.

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This discussion was created from the release calc 2.15.1.0 release.

[pmetzger]

I updated MacPorts.

[lcn2]

Thank you 🙏 for this information and your support of calc under Macports, @pmetzger