Gui Enhancement: Support for macros in AppUserHome/Macro

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What?
It was suggested that the macros should be moved to AppUserHome/Macro
http://forum.freecadweb.org/viewtopic.php?f=10&t=13433

Solution:
The solution is backwards compatible in the sense that if you have a running
configuration, updating should not change anything.

For new installations the macro directory will default to AppUserHome/Macro. However
this would break all the installation scripts (probably also ME's plugin manager).

Conflicts:
	src/Mod/Path/Gui/AppPathGuiPy.cpp

src/Gui/Command.cpp

@@ -722,7 +722,7 @@ void MacroCommand::activated(int iMsg)
 {
     std::string cMacroPath = App::GetApplication().GetParameterGroupByPath
                              ("User parameter:BaseApp/Preferences/Macro")->GetASCII("MacroPath",
-                                     App::Application::getUserAppDataDir().c_str());
+                                     App::Application::getUserMacroDir().c_str());
 
     QDir d(QString::fromUtf8(cMacroPath.c_str()));
     QFileInfo fi(d, QString::fromUtf8(sScriptName));