Tasks for the command line interface

• assigned: pjotrp, artyom
• type: feature
• priority: high

• [ ] Provide sane CLI interface
• [X] Add --map-size 10M switch
• [X] Use lmdb files instead of dir
• [X] Find a way to open/create named DBs

Not possible???LMDB is a directory with data.mdb, by definition. For now, mgamma renames and copies files under the hood, which is not cool, but kind of works.

• [X] Move mgamma into ./bin
• [ ] Add ./bin/mgemma compatibility tool (note it is not mgamma)