organize 66 library file with directories

package/deps.mak

src/lib66/backup/backup_cmd_switcher.c

src/lib66/backup/backup_make_new.c

src/lib66/backup/backup_realpath_sym.c

src/lib66/backup/deps-lib/deps

src/lib66/db/db_compile.c

src/lib66/db/db_find_compiled_state.c

src/lib66/db/db_ok.c

src/lib66/db/db_switch_to.c

src/lib66/db/db_update.c

src/lib66/db/deps-lib/deps

src/lib66/deps-lib/66

src/lib66/enum/deps-lib/deps

src/lib66/enum/enum.c

src/lib66/environ/deps-lib/deps

src/lib66/environ/environ.c

src/lib66/exec/deps-lib/deps

src/lib66/exec/ssexec_all.c

src/lib66/exec/ssexec_dbctl.c

src/lib66/exec/ssexec_disable.c