Short Description: Added Account utilities to retrieve lists of Supplies
Bug Number: n/a
Release notes (y/n): no
For Release Nums: 6.1

Added really basic, surprisingly absent utilities to retrieve a list of
Supplies to and from an Account.  This is implemented with two other 
new general methods enumerating closely-related (linked) SimObjs and 
their Accounts.

----------------------
Accounting/Account.hpp
Accounting/Account.cpp
----------------------

Added public methods:
  QList<Supply*> getAllSupplies() const;
  QList<Supply*> getUpstreamSupplies() const;
  QList<Supply*> getDownstreamSupplies() const;

  QList<Account*> getAccountsOnDirectlyLinkedSimObjs (
                    bool includeAcctsOnThisAcctsObj) const;

--------------
Sim/SimObj.hpp
Sim/SimObj.cpp
--------------

Added public method:
  QList<SimObj*> getDirectlyLinkedSimObjs() const;

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