make the form.cleaned_data attribute of form available in the __init__

[piscvau]

Hello
form.clean_field_name functions have no parameter passed to it as indicated in the documentation and need to access the form.cleaned_data dictionary. However this cleaned_data dictionary is not created in the __init__ of the form but only in the full_clean method of the form.

the need:
in the form.__init__, add closure functions as clean_field_name functions and use the cleaned_data dictionary as a free variable of this closure function. However this is not possible because the cleaned_data_dictionary is not yet created.

Suggested patch :
create the cleaned_data.attribute in the __init__ instead of the full_clean