[exim-dev] bool_lax and multiple conditions on routers

Folks,

I've committed changes which allow Routers to have multiple condition
options. As part of making this as simple as possible, I've added a new
expansion condition, bool_lax{}. It's much like bool{}, but input which
would cause bool{} to fail expansion cause bool_lax{} to return true.
Also, bool_lax{00} is false, because that's what happens on condition
lines too. A ... very curious state of affairs.

I'm not in love with the name "bool_lax" -- it was a
least-amount-of-thought name. We can change it any time up until the
4.73 RC packaging starts. If anyone has any better suggestions, please
follow-up in this thread.

Thanks,
-Phil