[base] Severity: fixes internal values for debugN severities.
[x0d] fully resolve instant-mode given path to its absolute path.
[examples] added simple TCP Echo Server
[base] Buffer: fix in memory managment around realloc() and lots of related work.

I hope I will never ever do such a big commit with so many related stuff
again, but this time it's better to just get it out, and prepare myself
better for the next time I have to touch such a core part.
[base] BufferRef: ensure data() returns a native char-pointer primitive and no object
quickie.
Merge pull request #12 from xzero/master

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