fix handling of c'tors with namespaced parent classes

fix handling of c'tors with namespaced parent classes

this is achieved by setting yyTokColonSeen under much narrower
conditions (when we are pretty sure that we are seeing the start of a
c'tor's initializer list), which allows us to unset it under much
narrower conditions (when we are pretty sure we are seeing the start of
the c'tor's body), so we now actually *do* skip over qualifications
which would confuse us.

Change-Id: Ic04bad57a08cc66d41094775570d25e7288e6324
Reviewed-by: hjk <hjk121@nokiamail.com>
Reviewed-by: Oswald Buddenhagen <oswald.buddenhagen@digia.com>