m2v2 LIST and BEANS features added.
m2v2 features added

PURGE, DEDUP, OPEN, CLOSE, CREATE, DESTROY, HAS
Add json-c dependency
new meta2v2 featues now managed.

PUT, SPARE, OVERWRITE, APPEND
Fixed memory management around hc_url in m2 actions.
Update README.md
Protocol completed with meta2 ops.
Removed useless /help handler

Its purpose has to be covered by man-pages, README.md, whatever excepted code.
Typos fixed (thanks to FVE)
Code split!

This has been done the ugly way. No headers, '.c' directly included.
It just works.
Code split (again)
Code split around json codec.
Fixed shameful yank/paste error
Added 500 Internal Error
Now map JSON into M2V2 beans.
m2v2 PUT now managed, with better error checks.
PUT described.
Merge pull request #1 from jfsmig/JFS-meta2-features

Jfs meta2 features