Removing support for include statements

[Rainer Müller]

Hello,

with MacPorts 1.9 we will begin to store Portfiles into the registry to
run activate/deactivate hooks later. For this, we cannot use the include
statement anymore as sourced files are not being stored in the registry
and therefore would not be available later.

As far as I was able to determine I was the only one maintaining ports
which use include which had been added before I took maintainership. Now
I already removed the include statements from vim, vim-app and bash.

Any objections to completely removing include from port1.0?

Rainer

PS: On a related note, from 1.9 on the versions in PortSystem and
PortGroup need to declare a stable interface or otherwise we will have a
similar problem.