Advanced search with format: Prepare latex for find

Advanced search with format: Prepare latex for find

Our findadv expects something like
	prefix + 'search'
so that the regex (which is latexified too)
can work on 'search'
(In the source, the prefix is denoted by lead_as_string)

The latex output contains structs like
	\foreignlaguage(abc}{xx\textbf{boldxx\textcolor{blue}{blue 1 blue 2} XX}}
which would never match the simple prefix.

Now the above is converted to
	\foreignlaguage(abc}{xx}\\
	\foreignlaguage(abc}{\textbf{boldxx}}
	\foreignlaguage(abc}{\textbf{\textcolor{blue}{blue 1 blue 2}}}\\
	\foreignlaguage(abc}{\textbf{ XX}}
Of course, more than one language or color in an inset can be searched for now.