Add copyright notice
value argument is optional in defvar
Better COND
Better `case' macro with multikeys
add smoketests for FIND and REPLACE
add not-entirely-correct VECTOR-PUSH-EXTEND

Conflicts:
	src/toplevel.lisp
export FIND

Conflicts:
	src/toplevel.lisp
make FIND and REPLACE work on vectors as well

Conflicts:
	src/boot.lisp
Redefine ATOM
Remove old FIND
Move sequence functions to sequence.lisp
Move more code to sequence.lisp
Merge DOSEQ into DO-SEQUENCE
Organize the functions in the file
Merge branch 'nikodemus-patch'

Closes #47