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Update copyright year. Fix return value

Nikolay Samokhvalov requested to merge return_value_fix into master

Update copyright: 2019.

In bash, return should use values 0-255. Negative are not allowed
– e.g., if fails in CentOS. See discussion: http://gnu-bash.2382.n7.nabble.com/bug-return-doesn-t-accept-negative-numbers-td2031.html

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