handle command line options (new macro), handle libxml2 (wasnt strictly needed with old stack), and cleanup/add some logging
added a macro to handle command line options, and make the SDK v1.4 required from now on
%include opcua_config.h so we can access the definitions also in the SWIG wrappers
remove the preprocessor instructions: the SDK v1.4 is now mandatory
xmlparser does not need to be linked
the LibXml2 and OpenSSL libraries are now always linked
LibXml2 must be found by cmake
moved from UaDemoServer to uaservercpp
added info that the custom SDK building options must be used for building the UAF too
Merge pull request #15 from WimPessemier/compatibility_with_sdk_1.4

Compatibility with sdk 1.4: some bugfixes: (py)UAF compiles now with the SDK v1.4, and basic examples seem to work in Linux.