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Simplify width inference to reduce the opportunity to make mistakes.

Simplify depth-first search (Driver.idfs) abd use it for width-related
graph walking.
Merge pull request #336 from ucb-bar/noisyreversewidth325

Simplify width inference to reduce the opportunity to make mistakes - fix #325
Fix poking Negative Values Fails - #334

Canonicalize POKE'd values and mask expected results before comparison.
Merge pull request #337 from ucb-bar/pokenegative334

Fix poking Negative Values Fails - #334
Add test for issue #335 - Null Pointer Exception on Floating Output.

This appears to have been fixed with pr #336 which rewrote the width
inference process.
Merge pull request #338 from ucb-bar/nullfloatoutput335

Add test for issue #335 - Null Pointer Exception on Floating Output.
move verifyAllMuxes before width inference
Merge pull request #339 from ucb-bar/fix_verifyAllMuxes

move verifyAllMuxes before width inference(issue #335)
Various -Wextra fixups

It appears that some more errors have either creeped into the Chisel
C++ header files or into GCC's "-Wextra -pedantic" set.  This patch
uses the same techniques as last time to hide these new errors.
fix binding naming
Registers are always named
fix delay suite results
verfiy all the muxes before width inference
Merge branch 'fix_binding_naming' of https://github.com/ucb-bar/chisel into fix_binding_naming
clang and gcc do not quite agree on -Wpragmas.
Merge pull request #345 from ucb-bar/pr/341

Clang/gcc inconsistencies with -Wpragmas.
Merge pull request #344 from ucb-bar/fix_binding_naming

Fix binding & register naming
Why isn't reset an input -  Signals only used as resets are trimmed #346.

Ensure that any nodes connected to an explicit reset are visited (in
all the tree-walking code).
Make implicit_reset a constant.
Provide test to ensure nodes attached to reset are processed.
Generate valid literal node names for the Dot backend.

If we're explicitly outputting literal nodes, make sure they have a
legitimate name and not just a number.