Change cond_where semantics

[tyt2y3]

resolves #414

[tyt2y3]

@e-rhodes

[ikrivosheev]

@tyt2y3 hello! Some comments)

[Sytten]

Can we add a test for backward compatibility where you first put a .cond_where(Condition::all()) then a couple of filters.

[tyt2y3]

Can we add a test for backward compatibility where you first put a .cond_where(Condition::all()) then a couple of filters.

Not quite got that. This is a breaking change, and the behaviour only affect the case where Condition::any() is preceding. I already added some more doc tests. Is that what you need?

Edit: I see your comment in another thread. Okay will do