[ADD] Added module password_change_restrict.

[alejandrosantana]

This module allow only admin and users within Access Rights to change passwords, disallowing the rest.

[moylop260]

Is posible add unitest?

[dreispt]

The module name should begin with auth_.

[hbrunn]

don't do this, remove the field in _register_hook - otherwise we loose all changes from other modules in the inheritance chain

[alejandrosantana]

In _register_hook or __init__? (I see other examples expanding SELF_WRITEABLE_FIELDS in __init__)

[hbrunn]

that shouldn't matter too much in this case. Generally, _register_hook is safer because your model is fully loaded (relevant if you need to look up stuff in the db, patch fields, etc)

[alejandrosantana]

@moylop260 As soon as I fixed @hbrunn recommendations, I will try to do tests.
@dreispt Agreed, I am changing it.
Regarding the other module, I think there are two functionalities there that should be separated. I could do a backport of this one to v7 if needed (but may take a delay) once this one is OK.

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