[BUG FIXES]
- Conflict detection for overloading operators is now more correct. If a
class consumed two roles that both had identical overloading methods
(because they got them from some other role, for example), this caused an
error, but it shouldn't. GH #4. (rjbs)
- Similarly, when a role consumes another role, conflicts in overloading
operators are now silently resolved in favor of the consuming role, just
as they are with methods. Note that conflicts between the fallback setting
for roles are still an error.