Correctly open corpora provided as a relative path.
Correctly open corpora provided as a relative path.

This fixes #120. The first instance of Dact determines its working
directory. Since Dact may have been invoked from another directory later,
it could not open corpora passed as a relative path. Now we will always
send the absolute path to the running Dact instance.

evdmade01/dact,rug-compling/dact,rug-compling/dact,evdmade01/dact,evdmade01/dact