makesure_stable should not be changed before the release #60

docs/DEVELOPER.md

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+## Files
+
+- [makesure.awk](../makesure.awk) 
+  - **what:** the core of the tool implemented in AWK
+- [makesure_dev](../makesure_dev) 
+  - **what:** sh-wrapper over `makesure.awk`. Relatively immutable. 
+  - **why:** running tests
+- [makesure_candidate](../makesure_candidate)
+  - **what:** self-contained sh scripts that embeds the `makesure.awk` content as AWK parameter
+  - **why** the final tool requires some sh additions to correctly initialize the core. Serves a candidate for next release.
+  - **how** is generated via `./makesure candidate` TODO link
+- [makesure](../makesure)
+  - **what** contains a latest released version of a tool
+  - **why** this one should be very stable and only change with a new release published
+  - **how** copied from `makesure_candidate` at the time of release in `./makesure release`