FTP code turned into state machine. Not completely yet, but a good start.
The tag 'before_ftp_statemachine' was set just before this commit in case
of future need.

Curl_addrinfo?_callback() and addrinfo_callback() now returns
CURLE_OK or CURLE_OUT_OF_MEMORY.
Add typecast in hostares.c.

removed tabs and trailing whitespace from source

set async.done to TRUE last in the addrinfo callback to prevent the risk that
the multi-threaded resolver does wrong

Gisle cleaned up remaining host resolve re-org issues

Source cleanups. The major one being that we now _always_ use a Curl_addrinfo
linked list for name resolved data, even on hosts/systems with only IPv4
stacks as this simplifies a lot of code.

+ when storing the address in the cache fails, cleanup the resolved address
properly
+ delete trailing whitespace

curl_global_init_mem() allows the memory functions to be replaced.
memory.h is included everywhere for this.

Major hostip.c cleanup and split into multiple files and easier #ifdef
usage.