the disable protocol stuff is now added

 * Make content encoding/decoding internally be made using a filter system.

 * Test the 'multi' interface more.

 * Introduce another callback interface for upload/download that makes one

   less copy of data and thus a faster operation.

   [http://curl.haxx.se/dev/no_copy_callbacks.txt]

 * Add configure options that disables certain protocols in libcurl to

   decrease footprint.  '--disable-[protocol]' where protocol is http, ftp,

   telnet, ldap, dict or file.

 * Add asynchronous name resolving. http://curl.haxx.se/dev/async-resolver.txt

   This should be made to work on most of the supported platforms, or

   otherwise it isn't really interesting.