Replace PrintException with PrintExceptionContinue + throw

Just a pet peeve.

(PrintException has exactly the same body as PrintExceptionContinue but
does a re-throw at the end. Move these re-throws to the call
site, this aids understanding what is going on as well as eliminates a
bit of code duplication in util.cpp)
script: reduce OP_RETURN standard relay bytes to 40

Per mailing list discussion.
Merge pull request #3737 from jgarzik/op-return-size

script: reduce OP_RETURN standard relay bytes to 40
Merge pull request #3749

4423571 Replace PrintException with PrintExceptionContinue + throw (Wladimir J. van der Laan)