add unit tests for fmt_xmlescape

escapecharc now supports non-ascii

add utf8 test suite

compile on osx again
remove asm version of i?mult64 (was needed only for clang because it
didn't have __uint128_t, but it now has it)

fix scan_netstring to actually correctly return the length of the transported string
add documentation

fix copypasted comment in fmt_asn1dertag
add man pages for add_of, sub_of and assign

fix corking behavior for the case where a buffer follows a buffer in
iob_send

add some single char escaping routines to fmt.h
pull in html5 entities from w3c and use those to do a proper scan_html decoding
fix an off-by-one in fmt_to_array
add a ton of unit tests for the fmt routines

add two more variable length integer encoding functions

formats

zero a buffer in io_passfd so valgrind does not complain when we pass it
to a syscall (which did not use the uninitialized parts anyway)

update Makefile for BSD users

64-bit cleanliness issue with auto-NULL-appending macros

write generic stralloc and array textcode wrapper functions
change textcode API to use long instead of int
add cescape fmt and scan functions to textcode
add fmt_foldwhitespace to textcode

add array API (http://cr.yp.to/lib/array.html)