Getting rid of port binaries in /software

[Ryan Schmidt]

> On May 18, 2016, at 6:05 PM, Mojca Miklavec wrote:
> 
> On 19 May 2016 at 00:25, Eric A. Borisch wrote:
>> If you are just looking to save some space at the expense of time, you could
>> set:
>> 
>> portarchivetype      txz
>> 
>> in macports.conf; on some of the big clang/llvm archives this is ~2x
>> improvement...
> 
> But in current implementation that probably means that all the
> packages have to be compiled locally?

Yes. Which will probably bring in build-only dependencies that weren't necessary before. Which will remove some of the space savings. So this is probably not a good change for users to make.

Instead, we should switch the pre-built binaries to txz, as we've though about doing before.