* implemented the send-queue stuff (partially); still

* implemented the send-queue stuff (partially); still
  not fully working due to (apparently) a send mail bug

* gtk/modest-edit-msg-window.c:
	- cleanup sending of message
* gtk/modest-account-assistant.c:
	- generate better (unique) server_account names
* modest-conf.h:
	- cosmetics
* modest-account-mgr-helpers.c:
	- clear up the TnyGetAccountRequestType/TnyAccountType confusion
* modest-mail-operation.c:
	- use the brand new send queue
* modest-runtime.[ch]:
	- manage the SendQueue singleton-per-accounts
* modest-tny-send-queue.[ch]:
	- minimalistic send queue implementation
* modest-cache-mgr.[ch]:
	- add SendQueue as a cacheable type
* widgets/modest-folder-view.c:
	- make resistant agains NULL names
* modest-tny-account-store.[ch]:
	- fix some bugs (TnyGetAccountRequestType/TnyAccountType confusion)
	- add sanity checking for types
	- cleanups

pmo-trunk-r787