** PSETQ now works as required in the presence of side-effecting
symbol-macro places;
** NCONC accepts any object as its last argument
+ ** :COUNT argument to sequence functions may be BIGNUM (thanks to
+ Gerd Moellman)
* fixed bug 166: compiler preserves "there is a way to go"
invariant when deleting code.
* fixed bug 172: macro lambda lists with required arguments after