Apply required migrations

[maiste]

This PR updates the code only to execute the migrations that are not already applied. It provides a new flag force to apply all the migrations to ensure we can keep the old behaviour.

The comparison is made this way:

	Compare result	Bound (aka force case)
Up	$version > origin \Leftrightarrow version - origin > 0$	0 : $\forall version \in \mathbb{N}^{+}, version - 0 > 0 \Leftrightarrow True $
Down	$version <= origin \Leftrightarrow version - origin <= 0$	maxint : $\forall version \in \mathbb{N}^{+}, version - maxint <= 0 \Leftrightarrow True $

Warning
This introduces a breaking change in the API. Maybe the release will need an upgrade in the Minor version.

It requires #3 to be merged before merging.

[tmattio]

Thanks @maiste! I just merged #3. Could you rebase on top of master?

[maiste]

Done ✔️

[tmattio]

Thanks! Do you think we could add a cram test for this? I'm happy to merge if you won't have time in the coming days so this doesn't block you on ocurrent

[maiste]

Thanks! We could merge it like this if that's ok with you?
I will add the tests during the week in a separated PR as I feel we need to have a complete set of tests for the entire systemes. What do you think? 😄

[tmattio]

Sure, let's merge now!