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Implement grok_atou as safe/strict atoi replacement.
For earlier discussion, see:
http://www.nntp.perl.org/group/perl.perl5.porters/2013/10/msg208680.html
https://rt.perl.org/Public/Bug/Display.html?id=116118#txn-1250187
grok_atou is completely new code, instead of trying to bolt
new parameters/flags to grok_number. This makes it easier to
be extremely strict, and not worry about breaking grok_number.