The functions for restoring saved games failed to properly correct the
t_chasee pointer of monsters chasing the player. Such monsters would
attempt to chase NULL instead, with predictable results.
The r_flags field in struct room was being written as an int and read
as a short. This caused the restore functions to receive the wrong
data, usually an impossible string length, and abort.
This breaks save compatibility, though the save files had problems
anyway: the r_fires field should have been used, instead of reading and
writing r_flags twice.
