Add global flag '--help/-h'. #119
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Fixes-71
What
Defines a global
--help/-hflag.Why
Currently,
mint handmint helpare implemented to show the help info. When usingmint -hormint --help, the help message is only shown due to the fact that--helpis actually not supported, and this is highlighted by aFATALerror message.How Tested
unittestto ensure that--help/-hbehaves in the same error-free manner as--verbose/-v.