v0.6.0

Stopping v0.6.0

Diff since v0.5.1

Merged pull requests:

• Rewrite _resources_check! for NLPStopping (#107) (@tmigot)
• avoid allocations zeros(0) (#109) (@tmigot)
• add parametric type for tol_check (#110) (@tmigot)
• Court-circuitting in check_entries_counters (#112) (@tmigot)
• Remove setdiff in domain check (#113) (@tmigot)
• Type-stable access to fx (#114) (@tmigot)
• Type optim check (#116) (@tmigot)
• Check length instead of init_field (#117) (@tmigot)
• Add setters for the State (#119) (@tmigot)
• Reimplement domain_check for NLPAtX (#120) (@tmigot)