Tests fail with locales without a dot radix

[eserte]

If the current locale uses a non-dot radix (e.g. German and most other European languages, which use a comma radix), then the test suite fails, but only for perls >= 5.22.0. Sample failing test case:

#   Failed test 'Simple mean ok'
#   at t/Catmandu-Fix-stat_mean.t line 18.
#     Structures begin differing at:
#          $got->{numbers} = '2,5'
#     $expected->{numbers} = '2.5'
# Looks like you failed 1 test of 4.
t/Catmandu-Fix-stat_mean.t ...... 
Dubious, test returned 1 (wstat 256, 0x100)
Failed 1/4 subtests 

Detailed reports will be visible in a few hours at http://matrix.cpantesters.org/?dist=Catmandu-Stat%200.03