- other cleanup
- don't need compat.decimal, that approach never panned out. hopefully
outside libs aren't pulling it in, they shouldn't be

become an externally usable package but still remains within the main sqlalchemy parent package.
in this system, we use kind of an ugly hack to get the noseplugin imported outside of the
"sqlalchemy" package, while still making it available within sqlalchemy for usage by
third party libraries.

will now be produced via the func.* accessor
as well, as users naturally try to access these
names from func.* they might as well do
what's expected, even though the returned
object is not a FunctionElement.
[ticket:2562]

True by default, if not passed explicitly,
on bindparam() if the "value" or "callable"
parameters are not passed.
This will cause statement execution to check
for the parameter being present in the final
collection of bound parameters, rather than
implicitly assigning None. [ticket:2556]

arguments is easier to understand
- add a test to ensure generic function can have a custom name

    to allow for user-defined GenericFunction
    subclasses to be available via the func.*
    namespace automatically by classname,
    optionally using a package name as well.