Gnumeric 1.12.54

John Denker:
	* Improve whitespace handling in html import.  [#671]

Morten:
	* Improve various desktop environments' icon discovery.  [#677]
	* New function ENCODEURL.  [#658]
	* New libpython configuration.  [#680]
	* Fix problem relating to sheet remove and conditional format.
	* Fix inconsistent rounding of half-way cases.  [#638]
	* Fix xlsx leaks.
	* Cell comment speed-ups.  [#692]

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