resolver fixes:

*) fix memory leak in resolver
*) fix resolver cache rbtree comparison
*) fix segfault in resolver:
   ngx_resolve_name_done() and ngx_resolve_addr_done() did not delete
   contexts from a resolver node waiting list.
*) fix "PTR ." case in address resolver
*) add quotes in an error message,
*) fix resolving an empty name (".")
*) use ngx_resolver_alloc() instead of ngx_resolver_calloc()
   since all fields are filled

server name related merges:

*) If .domain.com, .sub.domain.com, and .domain-some.com were defined,
   then .sub.domain.com was matched by .domain.com: wildcard names hash
   was built incorrectly due to sorting order issue of "." vs "-".
   They were sorted as
       com.domain  com.domain-some  com.domain.sub
   while they should be sorted as
       com.domain  com.domain.sub   com.domain-some
   for correct hash building

*) test space between "~" and regex in server_name and invalid_referers

*) do not run regex for empty host name since regex always fails in this case,
   the bug had been introduced in r2196

allow cross device temporary files atomic copying

cache management fixes:

*) separate cache loader process
*) use real file cache length, this fixes cache size counting for responses
   without "Content-Length" header and 304 responses.

various SSL fixes and features:

*) $ssl_client_verify
*) "ssl_verify_client ask" was changed to "ssl_verify_client optional"
*) ssl_crl
*) delete OpenSSL pre-0.9.7 compatibility: the sources were not actually
   compatible with OpenSSL 0.9.6 since ssl_session_cache introduction
*) fix memory corruption in $ssl_client_cert
*) issue SNI warning instead of failure: this is too common case
*) use ngx_log_error(), since OpenSSL does not set an error on the failure
*) add SNI support in -V output

various perl fixes:

*) fix ngx_http_send_special() for subrequests handled by perl
*) allow perl "sub{..."
*) restore environ, this fixes segfault on reconfiguration failure when
   perl module creates new environment
*) optimize error handling
*) use ngx_conf_set_str_array_slot() for perl_require
*) allow several perl_modules

style fixes

fix various failures handling