* client.c (send_arg, option_with_arg): Make args const.

* client.h: Likewise, for protos.
* cvs.h (find_files): New proto.
* find_names.c (find_files, strip_rcsext): New functions.
(find_rcs): Make arg const.  Use new find_files.  Improve header
comment block.
* hash.c (removenode, mergelists): New function.
(delnode): Use removenode.
* hash.h (mergelists): New proto.
* history.c (HistoryLogPath, HistorySearchPath): New globals.
(histfile): Remove global.
(get_history_log_name): New function.
(history, history_write): Use new functions.
(read_hrecs_file): New function containing most content from...
(read_hrecs): ...this function, which now accepts a path and a file
list and calls read_hrecs_file once for each file.
* history.h (HistoryLogPath, HistorySearchPath): Declare globals.
* parseinfo.c (parse_config): Parse HistoryLogPath & HistorySearchPath.
* sanity.sh (basic2-64): Remove obsolete comment.
(config): Test new history options.
(crerepos): Test local and remote in parallel.  Update to accomodate
new history behavior.