add authority metadata
move core test to its own file, test all features, and test syntax also
\R was added in 5.009005
on older perls, perl -c emits the base filename to stderr on success, not "syntax OK"
v2.025

 - more thoroughly test the generated test that no non-core modules are
   required, and syntax does not require a perl later than 5.8.8
 - fix use of regex syntax in script checking that required perl 5.9.5
 - properly screen out expected warnings from perl -c on older perls