Changed testform
Adaped tests after changing the testform
Added another testcase to check if there are the origin submitted values in the data attribute if the validation fails.
Added debugging output
Fix saving origin values in data attribute if validation fails.
Fixed rendering of errors
Transfer submitted values into a normalized form by removing formalchemy
specific keys in the fieldname.
Basic implementation for submitting data in the example server
Added example1 form for server
Basic setup of logging.
Changed expected render result to fix the test
Added formencode as requirement. we now use the htmlfill modul to prefill the
form with values.
Implemented _bool helper functions in the rules.
The function will check if the provided values is anything different the an
empty string or None. The function can  be used in expressions with
"bool($field)" and can be there for used to implement required rules.
Handle missing values in the convert function. Return None in case of an empty
string.
Add required rule to the fields rules if the flag required is set.
Change naming of fields with the formalchemy forms. Do not include model-pk
prefix in fieldnames anymore. This change makes some code obsolelte to convert
the fieldnames back and foth between internal representation and formalchemy.
Fixed import.
Fixed testcases.
Added docstrings
Imroved docstring.