Re-arrange python generator to make it clear what's auto-generated

* README: New file describing what each file is used for
* livvirt-override.c, libvirt-override.py, libvirt-override-api.xml,
  libvirt-override-virConnect.py: Manually written code overriding
  the generator
* typewrappers.c, typewrappers.h: Data type wrappers
* generator.py: Automatically pre-prend contents of libvirt-override.py
  to generated libvirt.py. Output into libvirt.py directly instead of
  libvirtclass.py. Don't generate libvirtclass.txt at all. Write C
  files into libvirt.c/.h directly
* Makefile.am: Remove rule for creating libvirt.py from libvirt-override.py
  and libvirtclass.py, since generator.py does it directly

libvirt-override.py

@@ -0,0 +1,144 @@
+#
+# Manually written part of python bindings for libvirt
+#
+
+# On cygwin, the DLL is called cygvirtmod.dll
+try:
+    import libvirtmod
+except ImportError, lib_e:
+    try:
+        import cygvirtmod as libvirtmod
+    except ImportError, cyg_e:
+        if str(cyg_e).count("No module named"):
+            raise lib_e
+
+import types
+
+# The root of all libvirt errors.
+class libvirtError(Exception):
+    def __init__(self, defmsg, conn=None, dom=None, net=None, pool=None, vol=None):
+
+        if dom is not None:
+            conn = dom._conn
+        elif net is not None:
+            conn = net._conn
+        elif pool is not None:
+            conn = pool._conn
+        elif vol is not None:
+            conn = vol._conn
+
+        # Never call virConnGetLastError().
+        # virGetLastError() is now thread local
+        err = virGetLastError()
+        if err is None:
+            msg = defmsg
+        else:
+            msg = err[2]
+
+        Exception.__init__(self, msg)
+
+        self.err = err
+
+    def get_error_code(self):
+        if self.err is None:
+            return None
+        return self.err[0]
+
+    def get_error_domain(self):
+        if self.err is None:
+            return None
+        return self.err[1]
+
+    def get_error_message(self):
+        if self.err is None:
+            return None
+        return self.err[2]
+
+    def get_error_level(self):
+        if self.err is None:
+            return None
+        return self.err[3]
+
+    def get_str1(self):
+        if self.err is None:
+            return None
+        return self.err[4]
+
+    def get_str2(self):
+        if self.err is None:
+            return None
+        return self.err[5]
+
+    def get_str3(self):
+        if self.err is None:
+            return None
+        return self.err[6]
+
+    def get_int1(self):
+        if self.err is None:
+            return None
+        return self.err[7]
+
+    def get_int2(self):
+        if self.err is None:
+            return None
+        return self.err[8]
+
+#
+# register the libvirt global error handler
+#
+def registerErrorHandler(f, ctx):
+    """Register a Python written function to for error reporting.
+       The function is called back as f(ctx, error), with error
+       being a list of information about the error being raised.
+       Returns 1 in case of success."""
+    return libvirtmod.virRegisterErrorHandler(f,ctx)
+
+def openAuth(uri, auth, flags):
+    ret = libvirtmod.virConnectOpenAuth(uri, auth, flags)
+    if ret is None:raise libvirtError('virConnectOpenAuth() failed')
+    return virConnect(_obj=ret)
+
+
+#
+# Return library version.
+#
+def getVersion (name = None):
+    """If no name parameter is passed (or name is None) then the
+    version of the libvirt library is returned as an integer.
+
+    If a name is passed and it refers to a driver linked to the
+    libvirt library, then this returns a tuple of (library version,
+    driver version).
+
+    If the name passed refers to a non-existent driver, then you
+    will get the exception 'no support for hypervisor'.
+
+    Versions numbers are integers: 1000000*major + 1000*minor + release."""
+    if name is None:
+        ret = libvirtmod.virGetVersion ();
+    else:
+        ret = libvirtmod.virGetVersion (name);
+    if ret is None: raise libvirtError ("virGetVersion() failed")
+    return ret
+
+
+#
+# Invoke an EventHandle callback
+#
+def eventInvokeHandleCallback (watch, fd, event, callback, opaque):
+    """
+    Invoke the Event Impl Handle Callback in C
+    """
+    libvirtmod.virEventInvokeHandleCallback(watch, fd, event, callback, opaque);
+
+#
+# Invoke an EventTimeout callback
+#
+def eventInvokeTimeoutCallback (timer, callback, opaque):
+    """
+    Invoke the Event Impl Timeout Callback in C
+    """
+    libvirtmod.virEventInvokeTimeoutCallback(timer, callback, opaque);
+
+