.deb problems with 0.99.2

[Olly Betts]

In a private mail, Mark Shinwell wrote:
> The prerelease debs don't seem to install successfully:
> 
> dpkg: dependency problems prevent configuration of survex-aven:
>  survex-aven depends on survex (= 0.99); however:
>    Version of survex on system is 0.99.2.

Oops.  I improved the dependency of survex-aven on survex by adding a
version requirement, but unfortunately it's not the full version number (it
doesn't include the prerelease number).

I'll fix this tomorrow.  Sorry folks.

Cheers,
Olly