Install ices0 as ices0 (and thus resolve a long-unnoticed conflict with ices),
clarify comment and pkg-descr to make clear that ices0 is for streaming mp3s,
add an rc-script, optionalize most dependencies, do not depend on lame by
default in order to enable the build of a binary package.

While here, modify comment of ices as well to make perfectly clear that ices
is for vorbis streaming.

Based on a submission by: "Dave" <dmehler26@woh.rr.com>