refactor form field value handling, to get a nicer api and an easier algorithm to get field's value Details: * new .typed_value / .display_value on fields * droped form_field_value on form * .value attribute of field instead of .initial * nicer field's __init__, allowing to give a lambda as value's value

include *.py

recursive-include data external_resources *.gif *.png *.css *.ico *.js
recursive-include i18n *.pot *.po
recursive-include migration *.py