OAK-2077: Improve the resilence of the OrderedIndex for dangling links

covered query > on lane 1
OAK-2077: Improve the resilence of the OrderedIndex for dangling links

covered query > descending on lane 0
OAK-2077: Improve the resilence of the OrderedIndex for dangling links

covered query >= ascending
OAK-2077: Improve the resilence of the OrderedIndex for dangling links

covered query >= descending
OAK-2077: Improve the resilence of the OrderedIndex for dangling links

covered query < descending
OAK-2077: Improve the resilence of the OrderedIndex for dangling links

covered query < descending
OAK-2077: Improve the resilence of the OrderedIndex for dangling links

WIP. Refactoring of testing. Cleaning the code. createContent()