Fix disappearing relationship type in inspector

* Set default caption in saved grass style
* Set default color in saved grass style
Prettier exception when backup target is different store
Merge pull request #3002 from lutovich/2.1-prettier-exception-in-backup

Prettier exception when backup target is different store
Remove artifacts from merge
Add missing code for closing the pageCache when used in migration/tools
Make CommandApplierFacade more generic.
Get exact count of number of nodes in the graph.
Get exact count of number of nodes with given label.
Get exact count of number of relationships in the graph.
Get exact count of number of relationships with given type.
Remove unused statistics service.
added stress tests for standard and muninn page caches
documenting stress tests
stress test pom needs obligatory nonsense
Adds checksum to START log entry toString()
IdMapping interface for BatchImporter that makes sense

derived from actual use case. Although there's only one implementation,
which is to use the actual node ids provided directly from the input
entities.

Basically the changes consist of:

 * having InputEntity#id(), InputRelationship#startNode()/endNode() return Object
 * IdMapper has something closer to an index interface with put and get
 * IdMapping is provided to BatchImporter#doImport and couple an IdMapper
   and IdGenerator (batch import version of an id generator)
 * NodeStage uses IdMapper#put in conjunction with IdGenerator#generate and
   IdMapper#sort in the end
 * RelationshipStage calls IdMapper#get
Merge pull request #3041 from oskarhane/fix_relationship_style

Browser Fix disappearing relationship type in inspector
Merge pull request #3063 from tinwelint/2.1-proper-id-mapper-interface

IdMapping interface for BatchImporter that makes sense
Speculative build fix for Windows
Add a test to confirm nameMatchPatternElements behaviour for parameters