* src/translation.{cc,h} (Util::compose_argv): New function with
the functionality of compose_impl() but using a format string of
type const char*.  This implementation operates on bytes instead of
Unicode code points, and copies the chunks between placeholders in
one go instead of each character separately.
(Util::compose): Call compose_argv() instead of compose_impl()
and change the type of the format argument to const char* because
the format string really should be a string literal.  Also, inline
all of these overloads since they just forward their arguments to
compose_argv() anyway, so that inlining actually reduces code size.

svn path=/trunk/; revision=636