Better postASP tscreen support using LyX-Code. More checks in preASP.
* Use Lyx-Code more extensively. Do not use begin/end_deeper * Better postASP support for non verbatim in tscreen. We want to support things like <tscreen><verb> I am a <tt/verbatim/ line </verb> I am not a <tt/verbatim/ line </tscreen> Since nsgmls will break lines when look changing commands are found in tscreen+non-verbatim, we need to make sure that LyX-Code commands are not sent neither during the look change nor in the line after it. No problem in verbatim+tscreen, since lines will not be broken. We use $inlookchange to signal this, 0 or undefined means no look change, 1 means in look change and 2 means last line ended a look change.
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