ccwl: Raise lambda** and syntax-lambda** errors as exceptions.

* ccwl/conditions.scm (&unrecognized-keyword-assertion,
&invalid-keyword-arity-assertion,
&invalid-positional-arguments-arity-assertion): New conditions.
* ccwl/utils.scm: Import (rnrs conditions), (rnrs exceptions)
and (ccwl conditions).
(group-keyword-arguments): Raise &invalid-keyword-arity-assertion on
error.
(lambda**, syntax-lambda**): Raise &unrecognized-keyword-assertion,
&invalid-keyword-arity-assertion and
&invalid-positional-arguments-arity-assertion on error.
* tests/utils.scm: Import (rnrs conditions), (rnrs exceptions), (srfi
srfi-1) and (ccwl conditions).
("lambda** should raise an &unrecognized-keyword-assertion on
unrecognized keywords in arguments with syntax objects as irritants"):
Check for &unrecognized-keyword-assertion.
("Unrecognized keyword argument passed to lambda** should raise an
&unrecognized-keyword-assertion condition", "Unary lambda** keyword
argument passed multiple arguments should raise an
&invalid-keyword-arity-assertion condition", "Wrong number of
positional arguments to lambda** should raise an
&invalid-positional-arguments-arity-assertion condition",
"syntax-lambda** should raise an &unrecognized-keyword-assertion on
unrecognized keywords in arguments", "Unrecognized keyword argument
passed to syntax-lambda** should raise an
&unrecognized-keyword-assertion condition with syntax objects as
irritants", "Unary syntax-lambda** keyword argument passed multiple
arguments should raise an &invalid-keyword-arity-assertion condition",
"Wrong number of positional arguments to syntax-lambda** should raise
an &invalid-positional-arguments-arity-assertion condition"): New
tests.

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