Added message explaining backup has been archived.
Fix bugs in PersistenceWindowPool

- Make it resilient against very small store size and memory size
  configurations.
- Make `allocateNewWindow` give up if it cannot map a BrickElement reasonably
  quickly.
This improves the internal iteration by up to a factor of 5.

It's still a bit slow, though.
Bumping to 1.9.8
Refactored master and slave switch code out of HAMS, so that it is mainly deciding and coordinating
Fixed a critical bug where an instance could be shut down and then switch to slave. This mainly impacts automated tests and causes "flaky HA tests".
Added test for when a new master becomes available during a slave switch.
Depending on gremlin snapshot to get build rolling
Fixes a cache poisoning issue.

- The new dense nodes relationship loading had a bug in it where
  if you asked it to load relationships of a type it did not have it
  would incorrectly mark the node as having no relationships at all.
  This corrects that.
Merge pull request #2278 from chrisvest/1.9-persistence-window-pool-of-love

Fix bugs in PersistenceWindowPool
and back to sanity, chicken and egg dependency problem "solved"
Add ORDER BY planning
Merge pull request #2295 from rickardoberg/hams-refactoring

HighAvailabilityModeSwitcher refactoring and fixes
Merge pull request #2283 from jakewins/2.1-cachepoison

Fixes a cache poisoning issue.
Bump version number to 2.0.3.
Merge pull request #2299 from jakub-/sort

Add ORDER BY planning
Fix a race in PersistenceWindowPool related code.

This closes a race window where a thread could mistakenly acquire a closed window from the PersistenceWindowPool.
When this happened, the bug would manifest itself as an "illegal position" exception from the getOffsettedBuffer call.
Remove unnecessary extra cartesian product check in Ronja
Show com exceptions from pull updates.
Merge pull request #2303 from chrisvest/1.9-mapped-buffer-race

Fix a race in PersistenceWindowPool related code.
Hopefully fix the Windows build.
Merge pull request #2307 from chrisvest/1.9-fix-windows-build

Hopefully fix the Windows build.