adding test of target-display when link is broken
adding a -1 option ; making test about wrong option relevant
adding -1 option
adding -1 option
Merge pull request #58 from Morovaille/master

adding test of target-display when link is broken
update -1 to 04_test_opt_c
add -1 to testsv2/bonus_06_test_opt_u.spec.c
printf tests
gnl changes
redo some gnl changes lost in wrong commit
printf tests
merge