checked int-int conversions

[Jaroslav Hajek]

hello,

please consider for applying the attached patch that implements
checked integer conversions - applies to converting
octave_int<T>, intXXNDArray and octave_intXX_matrix objects, as well
as Octave's builtin intXX and uintXX conversions.

-- 
RNDr. Jaroslav Hajek
computing expert
Aeronautical Research and Test Institute (VZLU)
Prague, Czech Republic
url: www.highegg.matfyz.cz
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