Gnumeric 1.8.1

Jean:
	* Fix graph paste.  [#507342]

Jody:
	* Fix cell comment positioning problem.  [#506017]

Morten:
	* Fix NPV doc problem.  [#506160]
	* Fix python compilation problem.  [#509023]  [508988]
	* Fix DSUM crash.  [#509427] 
	* Fix insert-current-date locale problem.  [#508237]
	* Fix xls read crash.  [#505330]
	* Plug csv leak.
	* Fix inter-sheet cut problem.  [#511706]

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Gnumeric 1.8.0