* lib/net/protocol.rb: Protocol#start returns the return value of block.
* lib/net/protocol.rb: set timeout limit by default.
* lib/net/protocol.rb: new methods WriteAdapter#write, puts, print, printf.
* lib/net/protocol.rb: change template method scheme.
* lib/net/http.rb: rename HTTP#get2 to request_get, post2 to request_post ...
* lib/net/pop.rb: POP#auth_only did not work.
* lib/net/smtp.rb: should not resolve HELO domain automatically.


git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/branches/ruby_1_6@1992 b2dd03c8-39d4-4d8f-98ff-823fe69b080e