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.
Menu's Programs directory for current user or all users.
Move bulk of DPWS options outside the getopt case statement.
* utils.sgml: Update cygpath section for ADPWS options.
(main): Reflect argument change for dump_setup.
* dump_setup.cc (dump_setup): Add preliminary extra argument for future use.
* path.cc (read_mounts): Open registry with read-only access.