Imported from archive.

Imported from archive.

* command (command:show), mudpy.py (command_show): Improved
parameter descriptions in the help text for the administrative show
command, and added a file parameter to allow listing of elements
included within a known data file.

* command (command:show), mudpy.py (command_show, get_loglines):
Modified the administrative show log command to take parameters for
filtering and start/stop entry ranges.

* mudpy.py (DataFile.load, Universe.load, command_reload)
(reload_data): The administrative reload command now re-reads data
from read-only data files and updates the corresponding elements.
(command_show): Refactored if/then spaghetti logic to be easier to
follow.