Changed default behavior of 'avocado init' to *not* prepend the model name


Changed default behavior of 'avocado init' to *not* prepend the model name to the field name.  Furthermore, an attempt is made to preserve any manual titling
in the verbose names of the underlying field and its model.  E.g. if the
programmer adds an explicit verbose_name argument to a field constructor that
contains capital letters, that verbose name will be used verbatim.  There is a --verbose-names switch to the init subcommand that implements the previous default behavior (with the titling improvements).