[patch] add a bitvector class

[Rafael Espíndola]

I have started cleaning up my hack to support compressed NEFs.  The
attached patch is a helper class. It wraps a buffer in a bit vector so
that it is easy to access each individual bit. In practice I use only
the iterator, but I like being able to use a STL like loop

for (i = v.begin(); i != v.end(); ++i) {
}

I am not very familiar with C++, but I think I managed to get all the
types right.

Next stop: huffman decoder :-)

Cheers,
Rafael
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