[patch] wide streams - last version

[Georg Baum]

I updated my wide streams patch to current svn, incorporating the feedback 
from Angus. Since I did not get objections I am going to put it in now.

I attach the patch for reference, since it is too big for the automatic 
commit message.


Georg

Log:

Introduce wide streams. This fixes the remaining problems of plain text
export (e.g. the ToC) and the navigate menu.

        * src/insets/insetbase.h
        (InsetBase::plaintext): output to a docstream
        (InsetBase::textString): ditto

        * src/mathed/TextPainter.h
        (TextPainter::show): ditto

        * src/support/docstream.[Ch] New file and string streams for
        docstring. The file streams convert to UTF8 on the fly.

        * many more files: Adjust to the changes above

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