Updates for x86-64, adjusted memory_space.cpp to have O(ln(n)) complexity instead of O(N) in a few commo cases.

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Partial nonce-code -- should be silent without IRDB relocs added.  Also refactored byte_map into memory_space.

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Instead of adding a new segment to point to strata,
put the .strata section in the 1th segment. This
will prevent the additional segment header from
overwriting part of the text segment when the
.text segment starts very early in the file.

1. Add the ability to rewrite section headers.
We need this because extending sections requires
that their headers be rewritten or the contents
that are in the extended ranges get zero-d.

2. Internally "segmentize" the .strata section
We no longer need to call out to add a segment
for .strata.

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cgc_allocate returns 0 on success