Review everything related to Editors / Modules

This issue is more abstract.

A review of the all the stuff related to editors/modules is needed. It's not very well commented but I would be happy to help explaining what is going on.

A Module displays basically information corresponding to a Django model.

The Editor can be thought as Form Manager. It contains Fields.

Each module should have a custom editor.

You also have groupModules to handle cases where you can have multiple times the same module (for example several CountryScholarships).

Few improvements I see:

• Remove all the formManager={this} (and add field / removeField: the Editor should be able to detect its field by looking through its props.children
• Instead of giving a value to a field and a fieldMapping, maybe give it modelData and fieldMapping (it would reduce redundancy). Or better create a new prop and give it an array of [modelData, fieldMapping]. You would need to add a prop extractValue, a function that takes props.modelData[props.fieldMapping] and make the potential necessary conversions (e.g. dates).
• Review the stuff related to invalidate...