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