An un-initialized field in the configless code path leads to a crash on the first request.

some [ implementation will warn about "bad number"

With the newish automatic string concatenation, options like `mime' that accepts two strings as parameter start to become ambiguous: which strings gets concatenated? Instead of trying to document in the manpage which argument(s) is subject to string concatenation, do the concat always and introduce a separator. In the case of mime, `to-ext' now acts as a separator to distinguish. While there, also use a new keyword because it sounds better. It's dead-easy to upgrade to the new configuration, possibly with some sed magic, but for the moment the old `mime' form is preserved: (with a warning!) Will be dropped in the next release.

Setting the environment variable SKIP_RUNTIME_TESTS to 1 will prevent the runtime tests. This is useful when running the tests inside a sandbox. based on a similar diff by Anna "CyberTailor"

and while there reorder the targets in the Makefile a bit

with the recent changes, sometimes the path may not start with a '/'. This ensures that %s is ALWAYS an absolute path.

the 1024 bytes limits is for the META only, not for the whole response. That means that the maximum size for the header line is 1029!

before we did `pkill gmid', but that would influence also other instances of gmid!