SEGSAdmin doesn't appear to recognize other DBMS like psql or mysql

[broxen]

Summary

Segsadmin simply checks that the SQLite files exist. We should rewrite to work with other DB drivers like psql and mysql.

[mobbyg]

Does QT compile MYSQL drivers during the build process? I noticed on my Mac when building, there was no MYSQL driver and I had to build separately. After that, I did run into that issue with Admin not seeing DBs in MySQL. I ended up creating the DBs manually, and then Admin was able to find them and created the new server admin account with no issues.