Fabien COELHO's zero-balance patch.

[Derek Atkins]

Log Message:
-----------
Fabien COELHO's zero-balance patch.

	* src/report/standard-reports/balance-sheet.scm:
	* src/report/standard-reports/pnl.scm:
	  Fabien COELHO's zero-balance patch to remove accounts of
	  zero balance from the report.

Modified Files:
--------------
    gnucash:
        ChangeLog
    gnucash/src/report/standard-reports:
        balance-sheet.scm
        pnl.scm