Also added find_trees_not_rooted_with_tag().

1 instead of infinity.

spec appropriately.

--HG--
rename : dlib/server/server_http_1.h => dlib/server/server_http.h
rename : dlib/server/server_iostream_1.h => dlib/server/server_iostream.h
rename : dlib/server/server_kernel_1.h => dlib/server/server_kernel.h

say ::kernel or anything to instantiate them.  Still need to
move their method implementations into cpp files.

by other tools.