make it easier to debug bugs like #220, in dynamic param searching
fix an output proplem with debugging via stdout (encoding in python 2)
line and column return None in case of builtin module, fixes #221
tests for #221
deprecate start_pos as discussed in #221
previous fix had still bugs, now finally fixes #221
remove all the deprecation warnings in jedi itself
rewriting dynamic search_param stuff, should be faster now (fewer executions) and i hope that this fixes #220