CMake: also verify libzmq.so version

Before, we used the libzmq.so symlink to link to ZMQ. This can
be problematic when users have multiple ZMQ installations because
the symlink can point to an arbitrary version.
Merge pull request #205 from toxeus/zmqLibVersion

CMake: also verify libzmq.so version
Removed leftover debugging assert.
Merge pull request #253 from benma/otcontract

Removed leftover debugging assert.
Fix SWIG mapping

time64_t was not correctly mappend to intger in python. Time64_t was only unknown object.
Merge pull request #254 from mhamrle/fix_python_wrap

Fix SWIG mapping
CMake: Packaging: No default package contact
core/CMakeLists: Add subdir header files
Removed unused ProcessInBuffer, ProcessReply functions.
Merge pull request #258 from benma/cleanup

Removed unused ProcessInBuffer, ProcessReply functions.
Merge pull request #255 from lclc/develop

CMake: Packaging: No default package contact
CMake: remove unused hack for ZMQ

The ZMQ submodule is used for Windows that does not have proper
package management. But the hack is not used for Windows and
therefore unnecessary.
Merge pull request #260 from toxeus/removeZMQhack

CMake: remove unused hack for ZMQ
Merge pull request #261 from lclc/swifg

core/CMakeLists: Add subdir header files
Removed dead code.
Merge pull request #263 from murrekatt/cleanup

Removed dead code.
cppcheck: update includes
Merge pull request #264 from toxeus/updateCppcheckIncludes

cppcheck: update includes
Removed SWIG defines from OpenTransactions.hpp because SWIG is not seeing this header so it should be fine.
Removed dead meat.