Youness Alaoui

I tried your branch as well, and it works great. Though it seems that I still get the 401 unauthorized errors when it loads the session from file, so it...

> @kakaroto yeah I know, this PR doesn't aim to solve that problem yet... I'm not really using that functionality so I don't know if/when I'll fix it, sorry! No...

> The `LOCK` file would still be needed to prevent unintended write opens, or opens of an already locked db. Only it should use type `F_RDLCK` instead of `F_WRLCK`. Good...

> one way to achieve the open in read only mode is to write own Env object which provides copy on write operations, when new files are stored in memory...