Bug#811682: FTBFS with GCC 6: could not convert a from x to y

[Gert Wollny]

Control: tags -1 patch 

Hello, 

the attached patch fixes the reported compile error and also fixes the
"narrowing conversion" errors that came up with g++-6.

The package now builds with g++-6 (but it is not lintian-clean). 

Best, 
Gert 
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