Fix bug 3034

Fix bug 3034

	* src/mathed/InsetMathGrid.C: Don't declare mathed_parse_normal,
	include MathParser.h instead
	(InsetMathGrid::doDispatch): remove to_utf8, mathed_parse_normal
	takes now a docstring

	* src/mathed/MathMacroTemplate.C
	(MathMacroTemplate::read): restore the version of 1.4.x, since
	the new one did only work for macros without whitespace

	* src/mathed/MathParser.[Ch]
	(Parser): Add constructor from a docstring
	(mathed_parse_cell): Create the parser directly from the string,
	since the istream variant of tokenize() does only work if reading
	from the .lyx file
	(mathed_parse_normal): ditto
	(mathed_parse_normal): Delete the istream variant (unused)

git-svn-id: svn://svn.lyx.org/lyx/lyx-devel/trunk@16334 a592a061-630c-0410-9148-cb99ea01b6c8