* enable getting debug information over dbus; for now

* enable getting debug information over dbus; for now
  we can get the operation-queue contents; other things can be added later.

it can be retrieved (from cmdline):

run-standalone.sh dbus-send --print-reply --dest='com.nokia.modest' /com/nokia/modest com.nokia.modest.Dump

this will print it to stderr wherever that is for modest, and also return it as a string
over dbus. if you're lucky, you get something like:

modest debug dump
=================
mail operation queue (01)
-------------------------
0x82e7c00 "NokiaID_store" (RECEIVE) [IN-PROGRESS] {1/100} ''

pmo-trunk-r3991