Use absolute paths in seq file?

I've noticed that after running something like
```
mlist <relative path to maildir> | mseq -S
```
the sequence file $MBLAZE/seq contains relative paths to message files. From my perspective, it would be nice to convert them into absolute paths, as, I believe, a user expects mblaze to use the same files after changing the current directory. At least, I do so:)