Use create method implemented in File.py

[Marek Havrila]

https://github.com/x00Pavel/SCAutolib/blob/299532674f9b1ca618fbd33c5327ab06fad936f4/SCAutolib/models/CA.py#L113
This and following lines should be solved as call of create method rather than implementing it here.

[Pavel Yadlouski]

Done