portversion vs. pkg_version

[Sergey Matveychuk]

It looks like portupgrade disagrees with pkg_version -t on version 
comparing:
% pkg_version -t 1.4.0.a3_1 1.4
<
% portversion -t 1.4.0.a3_1 1.4
 >

and I guess pkg_version is right and portversion should be fixed.
Or portupgrade should run pkg_version for version comparing (it's seems 
to be a quick and right way to fix).

-- 
Sem.