3.11.0.0
new option "--robust" : stay alive if mysql goes away (waiting for comeback)
nb: minor backward compatibility break !
 previous version (<3.11) had "robust" mode by default, waiting for mysql to come back, thus preventing parent (scheduler...) to quit.
 now BY DEFAULY the indexer is "fragile" and clean quits if mysql goes away.
Merge pull request #12 from jygaulier/3.11.0.0

3.11.0.0