66 improved contraction pressure

[MaxBalmus]

A new model proposed as an alternative to KorakianitisMixedModel called KorakianitisMixedModel_PP (preserved pressure). It uses a slightly modified chamber model HC_mixed_elastance_pp, which modifies the total pressure from the form:

p(t,v) = [1-a(t)] * p_pas(v) + a(t) * p_act(v)

to:

p(t,v) = p_pas(v) + a(t) * p_act(v)

This new format prevents the pressure during contraction from being lower than the passive equivalent.

[LevanBokeria]

Looks good @MaxBalmus
If this model is going to be actively used and be part of the public facing package, shall I write a quick tests for it? I can just push the commits to this branch directly.

[MaxBalmus]

Thanks, @LevanBokeria, yes I plan to eventually have it replace the base version. Yes if you have some time to add some tests that would be great.

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[MaxBalmus]

Looks good to me.