Fix cleanup / search / results order + CI

[rockandska]

• complete -F _minimal was not wrapped
• cleanup was not done as intended due to typo in variable name
• fix shellcheck errors
• fix search
• depending on os / bash version / config, compgen results was not in the same order and so the CI was not stable, so a sort function was add for this purpose and could be override by the user if needed
• add a beginning of CI tests to avoid regression ( need to add doc about them later and the purpose of TESTS_DEBUG , TESTS_PAUSE, TESTS_DELAY_KEYS env running them )