slaprunner-resilient: resilient-clone-number parameter is now 2 maximum

So that it corresponds better to its name
runner: new parameter "resilient-clone-number" documented
slaprunner: deploys new file to know current working dir in minishell
slaprunner: new parameter in slapos.cfg (for minishell's history)
slaprunner: unify parameters'name in template for slapos.cfg
slaprunner: follow conventions for templates in part directory