waf, git, EPOCH, version strings, ...

[Hal Murray]

I think the tangle mentioned at Issue #313 needs wider discussion.
  ntpsec | build version not updated after git pull (#313)
  https://gitlab.com/NTPsec/ntpsec/issues/313

A while ago, we changed things to not use __DATE__.  Maybe we didn't get that 
right.  Maybe the default should be to use __DATE__ with configure options 
for alternates.

configure sets up NTPSEC_VERSION_STRING
ntptime is the only useage.

There is a --build-version-tag=xxx option to configure.
It gets used in NTPSEC_VERSION_STRING, but see above.

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I'm assuming the EPOCH date will also be the date in the version string.

I'm happy to recompile everything after a git pull.

I'd like to get a new version string without rebuilding everything.

I'd like the version string to indicate that I'm running something built with 
local edits that haven't been committed yet.

I have a script to erase and build and another to build after an edit so I 
have a handy place to put complicated recipies.


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