&rest and &aux can't coexist anymore in lambda lists

[stassats]

(compile nil '(lambda (&rest foo &aux x)))
=>
The value FOO is not of type LIST.

And some illegal combinations are accepted:

(compile nil '(lambda (&aux x &rest)))
Treats &rest as a variable. Which is correct in theory, but highly unlikely to be used on purpose.

(compile nil '(lambda (&rest args &optional x)))
(compile nil '(lambda (&key key &optional x)))

[ehuelsmann]

(In [14138]) Re #241: Fix cases

(compile nil '(lambda (&rest foo &aux x)))

and (compile nil '(lambda (&aux x &rest)))

Note: Since the other 2 cases mentioned in the ticket are still

open, this commit doesn't actually close it.

[stassats]

Good, now drakma can be compiled again.

[ehuelsmann]

(In [14146]) Re #241: Add test cases.

[ehuelsmann]

(In [14147]) Close #241: Fix "part 2": ABCL accepts disallowed lambda list ordering.

Note: Solved by rewriting PARSE-LAMBDA-LIST.