JPSSnagg

src/nagg_options.c:
Added --like option to the usage().

test/testfiles/usage.txt:
test/testfiles/usage-bad-option.txt:
Updated the usage output to include the newly added like option.

test/testnagg.sh:
test/nagg_functions.sh:
Added --version tests. Fixed some output format in CHECK_VERSION.

Tested: koala.