Searching objects: container, domel, dry

Moved container object get method info static pwf#search_object to be
used externally
Container object, coding style
Domel object, coding style
Caller object, coding style
[fix] Container object, get_attrs
Test container object
Added object_set value
Container object, use pwf#object_set
Refactor, search_obj -> obj_search
Version bump, 1.6.6