from_elan method updated.
Parser class with XPath deleted.
Metadata information added to list.
Generate graf files method updated.
Generate graf files methods updated.
Extra information retrieved.
Script removed.
Parser/writer documentation updated.
Class AnnotationGraphFilter added to module.
Filter methods addded to AnnotationGraph class.
Class AnnotationGraphFilter updated.
AnnotationGraphFilter tests added.
Test annotationgraphfilter changed.
AnnotationGraphFilter class updated. AnnotationGraph class filter methods updated.
Tests of AnnotationGraphFilter updated and passing.
Methods _fix_time_slots and _find_time_slot_value added.
_find_node_from_edge_filter added and method append_filter updated.
Test append_filter added.
Test reset_filters added.
Method reset_filters updated.