Get Cosmopolitan into releasable state

A new rollup tool now exists for flattening out the headers in a way
that works better for our purposes than cpp. A lot of the API clutter
has been removed. APIs that aren't a sure thing in terms of general
recommendation are now marked internal.

There's now a smoke test for the amalgamation archive and gigantic
header file. So we can now guarantee you can use this project on the
easiest difficulty setting without the gigantic repository.

A website is being created, which is currently a work in progress:
https://justine.storage.googleapis.com/cosmopolitan/index.html

libc/conv/conv.h

@@ -8,13 +8,6 @@
 │ cosmopolitan § conversion                                                ─╬─│┼
 ╚────────────────────────────────────────────────────────────────────────────│*/
 
-/**
- * COBOL timestamp (1601) for UNIX epoch (1970).
- *
- * It's a well-known fact in the social sciences that the introduction
- * of the UNIX operation system signalled the end of modernity. Windows
- * timestamps are living proof.
- */
 #define MODERNITYSECONDS 11644473600ull
 #define HECTONANOSECONDS 10000000ull