class_docstr: Wrapper for filters added via .addfilter to turn them
  into processors.
  
  Filters are callables which
  
    - Take a ``data`` as an argument
    - Return False if the current bar has not triggered the filter
    - Return True if the current bar must be filtered
  
  The wrapper takes the return value and executes the bar removal
  if needed be
code: def __call__(self, data):
      if self.ffilter(data, *self.args, **self.kwargs):
          data.backwards()
          return True
  
      return False
  
imports: from __future__ import absolute_import, division, print_function, unicode_literals
  import datetime
  from datetime import datetime
  import inspect
  from .utils.py3 import range, with_metaclass
  from .lineseries import LineSeries
  from .utils import AutoOrderedDict, OrderedDict, date2num
label_desc: Use image node_id 2 for calling the SimpleFilterWrapper obj's underlying member method code with example usage: obj.__call__(data) and returns: False, True