Resolve "Missing methods in Documentation"

Closes #217 (closed)

Added the following documentation:

• tango.Device_5Impl

get_attribute_config get_attribute_config_2 get_attribute_config_3 get_device_class init_logger is_attribute_polled is_command_polled poll_attribute poll_command set_attribute_config_3 start_logging stop_logging stop_poll_attribute stop_poll_command

• tango.DeviceClass

get_class_attr get_pipe_by_name get_pipe_list

• tango.Attr

check_type is_allowed

• tango.Util

get_device_ior get_dserver_ior init instance orb_run (NOT SURE ABOUT DESCRIPTION) server_cleanup

However, could not find the docu for:

• tango.Attr: write and read - no idea about signature, and, probably, wrong description
• tango.Util: orb_run (I guess it somehting similar to the server_run, but do not really catch the difference); set_interceptors - absent in cpptango reference, found in cppcode, but no comments on mehtod; set_use_db - cannot find anywhere