0.03 - 2015-09-07
    Restore flags if code within UNSAFE_SIGNALS fails (Slaven Rezic)

0.02 - 2005-10-13
    Don't use a source filter, but an UNSAFE_SIGNALS function with a (&) prototype
    instead. Suggested by Scott McWhirter. Side-effect: a semi-colon is now needed
    after an UNSAFE_SIGNALS block.

0.01 - 2005-10-12
    Initial version