Split interfaces on read/write-only

[laughedelic]

I would split typed and untyped graph interfaces on parts with

• writing methods (addVertex/addEdge, setProperty, commit)
• reading methods (the rest)
• and probably indexes-related stuff

In the writing part we can add general methods for schema initialization. Then it's used for importing data.

The reading part is used for working with an instance of already imported data.

@eparejatobes WDYT?

[eparejatobes]

yes, fine.

[laughedelic]

It's not as easy as I expected and we decided to close it (and maybe return later)