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Protect fragile parbox in demothesis author field

Ola Leifler requested to merge demothesis-protect-fragile-parbox into master

On some older versions of LaTeX, an error occurs when trying to use a "\parbox" within the author field of the demothesis:

! Argument of \reserved@a has an extra }.

For example, the error occurs on Ubuntu 14.04 LTS when using the LaTeX packages available in default repositories (i.e. TeX Live 2013/Debian). It doesn't seem to occur on Ubuntu 16.04 LTS (TeX Live 2015/Debian).

For more information about this kind of error, do a web search for: Use of fragile command in a moving argument

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