PerconaFT can assert when opening a dictionary with no useful information to error log

In ft/serialize/ft-serialize.cc : toku_deserialize_ft_from there are assertions such as checkpoint_count_1 == checkpoint_count_0 + 1 that indicate that one of the two dictionary headers was not considered acceptable, but it only asserts and does not print to error log any useful, contextual information where there is a lot of info that can be output.