Make the 'versions' table name configurable.

[aadrian]

Please make the 'versions' table name configurable, in order to avoid colissions with some other applications, or corporate policies.

[takezoe]

Basically, I don't recommend to share the gitbucket database with other applications. Not only versions but also any other tables can conflict. Regarding corporate policies, is only versions table problematic?

[takezoe]

Ah, no. This is request for solidbase, not for GitBucket. Sorry, I was confusing.

Supporting a different version table name in solidbase makes sense!