WebStyle: disable webdeposit blueprint

* WebDeposit blueprint is now disabled via a configuration option,
  and thus the menu is also no longer installed.
OpenAIRE: fix next-merge issues in deposit engine

* Next branch changed the behavior of user related attributes to return
  unicode instead utf8 encode 8-bit strings. These unicode values where
  concatenated with 8-bit strings, thus causing the 8-bit to unicode
  conversion to cascade through the code, and since 8-bit strings are
  decoded with ascii codec, lots of conversion errors happened.