Gnumeric 1.12.61

Morten:
	* Up gtk+ requirement to 3.20.  Still ancient.
	* Audit code with Gemini AI.
	* Plug leaks.
	* Make tests run in parallel.
	* Refactor analysis tools to be GObject-based.
	* Fix sampling tool gui in the periodic case.
	* Fix fill-series tool problems with dates.
	* Fix chi-square tool problems with labels.
	* Add basic testing of most analysis tools.
	* Disable excelplugins (unrelated to xls/xlsx files).
	* Fix gui crash [#857]
	* Introspection fixes.
	* Test suite enhancements
	* Preserve cvs-to-cvs and cvs-to-txt line endings.
	* Fix problems with search-and-replace.
	* Fix crash involding document properties and undo/redo.
	* Fix potential overflow in NT_SIGMA.
	* Improve primality test for large numbers.
	* Speed up number theory functions for values with a large
	  prime factor.
	* Fix TRIM to only cut spaces.
	* Fix problems with OFFTRAF in extreme cases.
	* Fix IFS semantics to match XL's as intended.
	* New functions XLOOKUP and XMATCH.
	* New functions TEXTBEFORE, TEXTAFTER, TEXTSPLIT.
	* Improve xlsx importer's mapping of function names.

Alex H:
	* Don't remove initial empty rows/columns for cvs/txt export.

N. Copa:
	* Fix parallel build trouble.  [#852]

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	* Print using pango context from GtkPrintContext for consistency