`default_transition

Hi all,

Currently, the syntax for `default_transition is 
	default_transition_compiler_directive ::=
		`default_transition transition_time
	transition_time ::=
		constant_expression

Because `default_transition can *only* be outside a module scope, one cannot have any constant_expression for the transition_time (because constant_expression includes module specific things too, like parameter_identifier) , this should be changed to 

	transition_time ::= 
		real_number

Thanks,
Prasanna
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Prasanna Tamhankar
Freescale Semiconductors, Adelaide
+61 8 81683585
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