(refs #9) Add abstract-hash-table.
(refs #13) Add cl21.core.cltl2.
(refs #9) Define compiler macros for hash-table.
(refs #9) Add cl21.core.util for development. It isn't included in cl21.
(refs #9) Stop replacing hash-table functions (gethash, remhash...) by generic functions. It can't be optimized with compiler macro.