core: made the core formatter to use a new flt2dec.

As a side effect `core::fmt::float` is gone now. This also slightly changes the float output, so this is: [breaking-change]
rust-lang · May 6, 2015 · 5aa9f38 · 5aa9f38
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diff --git a/src/libcore/fmt/float.rs b/src/libcore/fmt/float.rs