(double_scan, multi_scan): generalize double_scan into a scan
for multiple patterns. Rename to multi_scan.
(bug_wait, bug_write_inferior_memory): adapt to use the new
multi_scan in order to catch and represent target bus errors.
(bug_scan): currently unused, so comment out.
(bug_quiet): removed. Replaced with a standard user settable boolean.
(bug_ops, monitor_desc): now static.
(monitor_desc): in several places, check and/or set to NULL.
* remote-hms.c (hms_files_info): Add the appropriate items where
missing in the printf call.
* remote-bug.c: new file for m88k bug support.
* config/m88k/m88k.mt (TDEPFILES): added remote-bug.o.