signal.h header added
using CMake to build libpaxos2
Using dinamic linking
We don`t need it now
Changes from SVN merged:

https://libpaxos.svn.sourceforge.net/svnroot/libpaxos/trunk/libpaxos2/
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r115 | marco-tijuana | 2011-05-09 04:05:11 +0400 (Mon, 09 May 2011) | 5 lines

Changed typedef of iid_t to 32 bits on 64 bit machines too.
(4-byte required by BDB access method)
Updated printfs all around
Merge branch 'CMake_build'