GitLab

Use @reqlink and @reqdlink where appropriate. Fix lots of malformed

@ref, @xref and @pxref usages.  Also:
(@reqlink, @reqdlink, @linkhere): New markup macros.
(Document Edition History): Added missing @async markup.
(About Aux-Items): Added missing @field markup.
(Simple Data Types): Removed an unbalanced close parenthesis.
(LysKOM Data Types): Added missing @field markup. Removed an
	unbalanced close parenthesis.
(lookup-name): Added a missing close parenthesis.
(get-info-old): Added a missing close parenthesis.  This returns
	Info-Old, not Info.
(create-anonymous-text-old): Added missing @field markup.
(login): Added missing close parenthesis.
(local-to-global): Don't use fancy mathemtical notations for
	half-closed intervals.  Added missing @type markup.