calc 2.15.0.6 release

[lcn2]

The following are the changes in this release:

 Thanks to GitHub user @ashamedbit, a long standing memory leak in
 zrandom.c has been fixed.

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This discussion was created from the release calc 2.15.0.6 release.

[lcn2]

We have released calc v2.15.0.6 because it contains a fix of a memory leak in zrandom.c. And while the memory leak may not impact those who do not use the random builtin function (a Blum-Blum-Shub implementation), and while the pull request of commit a30a518 provided by @ashamedbit has not been widely tested, we nevertheless believe that the patch is on good order.

We have been planning to establish a calc v2 / calc v3 fork point as part of our current calc v3 plans. These plans include a calc code-base-wide K&R-like reformat (likely along the lines suggested by @pmetzger).

We will let the time we plan to spend (a referenced in comment 1873595215 to include the testing of the above mentioned patch. By the time calc v2.15.1.0 is released as a calc v2 / calc v3 fork point, the above mentioned patch will have been tested to the point where it can be consider part of a stable calc release.