Keep an extra copy of the database, just in case. Do some sanity

checking when copying file contents.  Allow compaction of the text
file even if there are errors in the data base.

ChangeLog

+1998-10-11  Per Cederqvist  <ceder@lysator.liu.se>
+
+	Keep an extra copy of the database, just in case.  Do some sanity
+	checking when copying file contents.
+	* src/server/simple-cache.c (pre_sync): Store the previous backup
+	file.
+	(copy_file): Abort if we cannot seek or read the file we copy
+	from.  Abort if the value we read didn't end in a newline, start
+	with "T ", "C " or "P ", if the identity number in the data isn't
+	what we expected, or if it isn't followed by a space.  This
+	change attempts to detect file damage as early as possible.
+	* src/server/server-config.c (parameters): Added "Backup file 2".
+	(read_configuration): Handle backupfile_name_2.
+	* src/server/ramkomd.c (init_data_base): Print backupfile_name_2.
+	* src/server/param.h (struct kom_par): Added backupfile_name_2.
+	* src/server/dbck-cache.c (cache_sync): Store the previous backup
+	file.
+	* doc/man/lyskomd.8: Added "Backup file 2".
+
+	Allow compaction of the text file even if there are errors in the
+	data base.
+	* src/server/dbck.c (main): Allow -g even if errors occured, but
+	only if the user confirms.
+
 1998-10-11  Per Cederqvist  <ceder@gratia>
 
 	More test cases.