Update functional memory to have a response event

Clean out old memory python files, move them into old_mem directory.  Maybe we should just delete them, they are under revision control.

Add new py files for new objects.

SConscript:
    Update because memory is just a header file now
base/chunk_generator.hh:
    Make Chunk Generator return the entire size if the chunk_size is set to zero.  Useful when trying to chunck on blocksize of memory, which can write large pieces of data.
cpu/simple/cpu.cc:
    Make sure to delete the pkt.
mem/physical.cc:
mem/physical.hh:
    Set up response event.
mem/port.cc:
    Rename rqst to req to conform to same standard naming convention.
python/m5/objects/PhysicalMemory.py:
    Update the params, inheritence

--HG--
extra : convert_revision : 857154ec256522baf423b715833930497999549b

python/m5/objects/MemObject.py

@@ -0,0 +1,5 @@
+from m5 import *
+
+class MemObject(SimObject):
+    type = 'MemObject'
+    abstract = True

python/m5/objects/PhysicalMemory.py

@@ -1,7 +1,7 @@
 from m5 import *
-from FunctionalMemory import FunctionalMemory
+from Memory import Memory
 
-class PhysicalMemory(FunctionalMemory):
+class PhysicalMemory(Memory):
     type = 'PhysicalMemory'
     range = Param.AddrRange("Device Address")
     file = Param.String('', "memory mapped file")