Jean-Marc Lasgouttes 04efe3c40a New framework for declaring generic features in textclasses.
* src/LaTeXFeatures.C (mustProvide): new method; returns true when
	isRequired is true and the feature is not provided by the
	textclass. 
	(getPackages, getLyXSGMLEntities): use mustProvide when relevant.

	* src/bufferparams.C (getEngine):
	* src/buffer.C (validate): adapt to change below.

	* src/lyxtextclass.C (read): replace tags ProvidesNatbib,
	ProvidesMakeidx, ProvidesUrl and ProvidesAmsmath by a generic
	"Provides".
	(provides): take a string as argument.
	
	* lib/scripts/layout2layout.py (convert): convert "ProvidesXxx" tags
	to "Provides xxx".

	* lib/layouts/*: update to format 4.



git-svn-id: svn://svn.lyx.org/lyx/lyx-devel/trunk@17740 a592a061-630c-0410-9148-cb99ea01b6c8
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