When ZOO-Kernel receive XML POST request including XML content for ComplexData? node, it failed if the first children node is not the root node of the data passed by value.

I noticed that when the ZOO-Kernel is requested to return a XML file then in the ExecuteReponse there is CDATA containing the XML file content as text when it should include the whole XML file content as XML node.

• unistd.h is not part of Visual Studio
• add a check for that in zoo-kernel/service_internal.h, around line#80, such as:

    #if !defined(USE_RUBY) && !defined(WIN32)
    #include <unistd.h>
    #endif