init_delay = response_window / 2.  Closes #677

This gives the event loop enough time to wake up, and set the
response_window timer before it fires
Double init_delay in preparation for halving it later.  Closes #677
Add notes on what's going on
Fixup SHA1 function names
Add dsp-id
Swap order of arguments in hmac functions so output is the first argument
Move hmac prototypes into the md5.h/sha1.h headers
Add %{hmacmd5:} and %{hmacsha1} xlat expansions
Fixup md5 function names
Fixup md4 function names
Fix pairfilter documentation
Add tests for hexadecimal IP addresses
Rename foreach-2 to something meaningful
url quote chars should be upper case
Add tests for urlquote (which currently would not pass)
Fix url quote, enable all url quote tests
Add urlunquote
Fix comment
Use casts for all urlquote tests
Fix UTF8 chars in %{escape:}, add %{unescape:} and tests