Deprecate find_dir_in_path in favor of dir_in_path. * NEWS: Announce deprecation of find_dir_in_path and new function dir_in_path. * scripts/deprecated/find_dir_in_path.m: Add script to call dir_in_path and give deprecation warning. * scripts/deprecated/module.mk: Add deprecated find_dir_in_path.m to build system. * utils.cc (Fdir_in_path): Renamed find_dir_in_path to dir_in_path. * help.m, what.m, rundemos.m, runtests.m: Chane instances of find_dir_in_path to dir_in_path. * utils.cc, variables.cc: Change seealso links to point to dir_in_path. * func.txi: Document dir_in_path function.

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