* All policy compilers: using FWObjectDatabase::createClass
methods to create rules and other objects in compilers wherever
the type is known at the (code) compile time. This makes code
cleaner and speeds it up a little because of eliminated cast() and
string comparison.
* changes in libfbuilder: eliminated excessive use of dynamic_cast
and long chains of "if" comparing object type names in
FWObjectDatabase in methods that create new objects of given type.
