Add the bus and connector objects to scons

change getPort parameter from char* to string
Add an extra phase between construction and init called connect

SConscript:
    Add the bus and connector objects to scons
cpu/simple/cpu.cc:
cpu/simple/cpu.hh:
    the connection to memory shouldn't be made until we know the memory
    object exists (e.g. after construction)
dev/io_device.hh:
    change to const string
mem/bus.hh:
    change getPort parameter from char* to string
    initialize num_interfaces
mem/mem_object.hh:
    change getPort parameter from char* to string
mem/physical.cc:
mem/physical.hh:
    change getPort parameter from char* to string
    get rid of the bus object I created last time
python/m5/objects/PhysicalMemory.py:
    get rid of the bus object I created last time
sim/main.cc:
sim/sim_object.cc:
sim/sim_object.hh:
    Add an extra phase between construction and init called connect

--HG--
extra : convert_revision : 0e994f93374fa72a06d291655c440ff1b8e155a9

SConscript

@@ -88,11 +88,13 @@ base_sources = Split('''
 	cpu/static_inst.cc
         cpu/sampler/sampler.cc
 
+        mem/connector.cc
         mem/mem_object.cc
         mem/page_table.cc
         mem/physical.cc
         mem/port.cc
         mem/translating_port.cc
+        mem/bus.cc
 
         python/pyconfig.cc
         python/embedded_py.cc