option handling to use the same style throughout all Cygwin utils.
Throughout use program_invocation_short_name to refer to current
process name in Cygwin executables.
* utils.sgml: Align documentation to above change. Add missing
sections for getconf, ldd, and setmetamode.
* strace.cc (proc_child): Avoid compiler warning.
(longopts): Rename mount-commands option to mount-entries.
(opts): Remove removed options.
(struct opt): Move up in file to allow using it in usage.
(usage): Change text for --mount-entries option. Remove
-X option. Add valid options output.
(main): Remove handling -b option.
(convert_spaces): New static function to convert spaces to "\040"
string.
(mount_entries): Renamed from mount_commands. Rewrite to emit
/etc/fstab compatible output.
(show_cygdrive_info): Print "nouser" rather than "system".
* umount.cc (longopts): Remove remove-all-mounts,
remove-cygdrive-prefix, remove-system-mounts, system and user options.
(opts): Remove A, c, s, S, u options.
(usage): Remove text for all removed options.
(main): Remove handling for all removed options.
(remove_all_mounts): Remove.
(remove_all_system_mounts): Remove.
(remove_cygdrive_prefix): Remove.
* utils.sgml: Fix mount and umount documentation. Move description
of (cyg,not)exec options to mount table section.
(change_cygdrive_prefix): Change MOUNT_AUTO to MOUNT_CYGDRIVE.
* umount.cc (remove_cygdrive_prefix): Ditto.
(main): Use default system/user flag for cygdrive stuff, too.
warnings before attempting a mount.
(longopts): Add no-executable option.
(mount_commands): Ditto.
(opts): Ditto.
(usage): Ditto. Indicate that system mount is now the default.
(main): Accommodate no-executable option. Make system mount the default.
* umount.cc (usage): Indicate that system umount is now the default.
(main): Make system umount the default.
