Define undefined conditions and handler functions following error-fun='error pattern
(Alan Ruttenberg) Activation of function are in in comments for now, pending solving boot issues. On malformed destructuring-bind, bogus-sublist-error was being signaled, but said condition didn't exist, and so true error was masked. On review this code seems to be adapted from CMUCL, but special casing error-fun = 'error and using program-error instead of the conditions. I brought over the conditions from CMUCL, which are in a comment at the bottom - they should loaded only after clos - wasn't sure of the mechanics. I then defined a function for bogus-sublist error, based on the reports for the condition, and replaced arg-count-error with the more detailed report as well. Merges <https://github.com/armedbear/abcl/pull/61>. From <https://github.com/armedbear/abcl/pull/61/commits/bdf75f5adeda85ca0a587b51c474112b825b5659>, <https://github.com/armedbear/abcl/pull/61/commits/78c7e0e3291ee97fbac2a8fa26bc55cf180b0b41>.
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