Bug#2060: dpkg and depends on version again

[Bill Mitchell <mitchell@mdd.comm.mot.com>]

> > How about
> >  <= => for less/greater than or equal to
> Ok
> >  << >> for strictly less/greater thani
> Ok
> >  <  >  for less/greater than or equal to (backwards compatibility,
> >          generates warning from dpkg-deb)
> Ok but an fatal error from dpkg-deb would be better than just a warning.

How about no warning on package config/install operations, and a fatal error
on package-build operations?

Also, less importantly, how about >= instead of => (or >=, => and <=, =<
as equivalent operations?).