Workaround for using together with ITERATE.
Fix optima.ppcre documentation.
Don't introduce boring MULTIPLE-VALUE-BIND.

Some implementation (e.g. ECL) goes wrong if binding variables of
MULTIPLE-VALUE-BIND is empty.  This commit eventually fixes this kind of
bugs.
Add optima.core package
Add Makefile for doc and test
Fix doc
Add [SIMPLE-]VECTOR* and SEQUENCE[*] patterns
Check number of arguments in {[SIMPLE-]VECTOR,SEQUENCE}* patterns
Typo fixes in README.md and optima.asd