#53 put ubh.metainfo into DATADIR

[James E. Pace]

I don't like having new files created in my home dir,
so I'd like
ubh.metainfo to be saved in the datadir specified in
.ubhrc.

Here's the diff with 1.78 to do it:

2514c2513,2515
< $metadata->write("ubh.metainfo");
---
> my $metadir = $platform->get_datadir() .
> $platform->get_separator() .
"ubh.metainfo";
> $metadata->write($metadir);