Add option to run without retrieving information from the database

[mklepaczewski]

It would be useful (for me) if I could use the tool having just the binlogs, without the need to access the database. As noted in the documentation, the database schema might be out of date and might actually provide confusing information. Furthermore, sometimes I fetch binlogs from a remote server for local analysis and it might be not easy to recreate remote schema. While I can use a dummy MySQL instance with no information about the schema (I haven't checked if it would work though), this seems unnecessary.

I might commit my own time to implement this (sooner or later ;-) ) if the feature is deemed useful and has a chance to be merged.