List of fitting functions for a menu

 Before using this, give the function a different name.

Function/S NewGF_FitFuncList()

	string theList="", UserFuncs, XFuncs

	string options = "KIND:10"
	options += ",SUBTYPE:FitFunc"
	options += ",NINDVARS:1"

	UserFuncs = FunctionList("*", ";",options)
	UserFuncs = RemoveFromList("GFFitFuncTemplate", UserFuncs)
	UserFuncs = RemoveFromList("GFFitAllAtOnceTemplate", UserFuncs)
	UserFuncs = RemoveFromList("NewGlblFitFunc", UserFuncs)
	UserFuncs = RemoveFromList("NewGlblFitFuncAllAtOnce", UserFuncs)
	UserFuncs = RemoveFromList("GlobalFitFunc", UserFuncs)
	UserFuncs = RemoveFromList("GlobalFitAllAtOnce", UserFuncs)

	XFuncs = FunctionList("*", ";", "KIND:12")

	if (strlen(UserFuncs) > 0)
		theList +=  "\\M1(   User-defined functions:;"
		theList += UserFuncs
	endif
	if (strlen(XFuncs) > 0)
		theList += "\\M1(   External Functions:;"
		theList += XFuncs
	endif

	if (strlen(theList) == 0)
		theList = "\\M1(No Fit Functions"
	endif

	return theList
end

This function is used in the Global Fit package to present a menu of candidate fit functions.
It includes gray items that separately label user-defined functions and XFUNC fitting functions.
Among other things, it filters out user-defined functions lacking the FitFunc subtype keyword.

The incremental building of options at the top of the function is partly a
leftover from when Global Fit had a checkbox that allowed you to optionally
list only functions with the FitFunc subtype. Note that XFuncs don't have
subtypes, so it's impossible to filter out non-fit XFuncs that have the
same signature as a fitting function.

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