type checking if all is set for error flows
removed mask. Set steadyState flag. set noerror on type token
added type checking on soruce types for outoging conditions.
Added handling of NoError in TypeToken.
added handling of all in flow when finding frlow from an incomign error
propagation.
helper method to return error propagation or all props from the error
soruce or path depending on "all"
Handling of "all" in error sources, sinks, and paths.