Fix dotted notation and incomplete input error reporting

Fixes #72
Fix lambda funcall ((lambda (x) x) 20)
Move FFI code to src/ffi.lisp
String and function FFI conversion
FFI conversion
More progresses in FFI
Define custom symbol object in prelude instead of plain objects
Merge branch 'master' of https://github.com/davazp/jscl into list-stuff
Rewrite ACONS and PAIRLIS tests using dotted lists
COPY-ALIST
RASSOC
Add KEY and TEST args to MEMBER
INTERSECTION
ADJOIN