Fixed a bug that set the all fields' datatype to varies in segments ending with a varies field
Fixed validation of elements 'varies' datatype
Fixed a bug in the parser
Fixed xsd parser to remove '_' from names ending or starting with it. Fixed elements structure
Added __repr__ method to ElementProxy and ElementList
Fixed conversion of numerical datatypes euqal to 0
Fixed a bug that didn't allow to insantiate a Field with its correct datatype (e.g. Field('PID_3', 'CX))
Fixed a bug with the to_er7() of Field and Component when their official datatype is ovewritten
Fixed a bug that allowed access to wrong children (e.g. Field('PID_3').ce_1, Component(datatype='CE').cx_1)
Fixed use of validation_level in base datatypes factories
Changed documentation index page
documentation minor changes
prepared for releasing
merged from develop