Replace erlang:binary_to_term() Erlang wrappers

Replace the 'erlang:binary_to_term/1' and 'erlang:binary_to_term/2'
Erlang wrappers taking care of failure after yield with management
of this in the hidden yield BIF.
Remove invalid 'bitstr' exports in erlang.erl

The dummy BIF exports 'erlang:bitstr_to_list/1' and 'erlang:list_to_bitstr/1'
seem to have appeared as a result of a copy-paste error and are now removed.
Prepare release