add a traceflag for functional accesses

add a traceflag for functional accesses
implement fix packet and add the ability to print a packet to a ostream
remove tabs in packet.hh (Could people stop inserting them??!?!?!)
mark const functions in packet.hh as such

src/base/traceflags.py:
    add a traceflag for functional accesses
src/mem/packet.cc:
    implement fix packet and add the ability to print a packet to a ostream
src/mem/packet.hh:
    add the ability to print a packet to an ostream
    remove tabs in file
    mark const functions as such

--HG--
extra : convert_revision : 4297bce5e1d3abbab48be5bd9eb9e982b751fc7c