Generate Doxygen into build directory.
Merge pull request #165 from murrekatt/doxygen

Generate Doxygen into build directory.
Removed old release notes. Maybe we should move that into the ChaneLog file?
Removed security comments.
OpenTransactions: remove ZMQ2 artifacts
Merge pull request #164 from murrekatt/develop

Removed some files in docs
Merge pull request #166 from toxeus/removeZMQ2

OpenTransactions: remove ZMQ2 artifacts
Fixed Windows problems with Version.hpp
Standard include path did not include the one in the build folder
OTLog.cpp needed the full path to the include file
Merge pull request #170 from BugFreeSoftware/fix_version

Fixed Windows problems with Version.hpp
git submodule: remove libzmq