Make improvements

- Add hierarchical auto-completion to redbean's repl
- Fetch latest localtime() and strftime() from Eggert
- Shave a few milliseconds off redbean start latency
- Fix redbean repl with multi-line statements
- Make the Lua unix module code more elegant
- Harden Lua data structure serialization

libc/time/time.mk

@@ -67,6 +67,10 @@ o/$(MODE)/libc/time/strftime.o:			\
 			-fdata-sections		\
 			-ffunction-sections
 
+o/$(MODE)/libc/time/localtime.o:		\
+		OVERRIDE_CPPFLAGS +=		\
+			-DSTACK_FRAME_UNLIMITED
+
 o/$(MODE)/libc/time/now.o:			\
 		OVERRIDE_CFLAGS +=		\
 			-O3