Provide a function called 'RICHTEXT()' for use in cell formulas in OOo Calc ,
that will take one string argument possibly containing html-like tags, and
return the plain text stripped of all the tags  --  and, when used as a
top-level function in a cell formula, will cause the returned text to be
formatted inside the cell according to those HTML-like tags. For example, a cell
with the following cell formula would then show the text "Title (subtitle)" with
nice bold/italic formatting:
		=RICHTEXT("<b>Title</b> (<i>subtitle</i>)")
The internal value of the cell, for example when referenced by another formula,
would however just be the plain string "Title (subtitle)".
At a minimum, the tags <b>, <i>, <u>, <color> and <size> (or however you wish to
name them) should be supported.
This would allow for much much greater flexibility and convenience for designing
visually pleasing dynamic spreadsheets, compared to the rather limited and
really cumbersome to use 'STYLE()' function and 'conditional formatting' feature.
(Note: Maybe it would then make sense to also introduce a 'MASK()' function,
that will augment a given string in such a way that 'RICHTEXT()' won't interpret
any part of it as formatting tags -- for example, by making the replacements
	"&"  -->  "&amp;"
	"<"  -->  "&lt;"
	">"  -->  "&gt;"
which 'RICHTEXT()' would then convert back to the original characters in it's
plain text output. This would then allow to safely write, for example:
		=RICHTEXT("<b>For bold text use the tag:</b> " & MASK("<b>")
which would display the string "For bold text use the tag: <b>" inside the cell,
with partially bold formatting of course.)