conf2: resolve an issue concerning variable numbers of parameters

conf2: resolve an issue concerning variable numbers of parameters

When a node of a link list is parsed on one line, then the inner section
is checked for dynamic attributes at the end.  If they are present, the
outer node is just parsed once and the flag allowing dynamic parsing is
passed inside.  If we did not allow this, then an error would have occured
anyway, and this behaviour is actually useful.

Along the way, I unified the headers and semantics of most interpreters and
cleaned up the code.