Cleanup EideticRequestMonitor
Log when property chains have duplicates

* Introduces the cappedLogger in StringLogger.
* Add a PropertyChainVerifier that checks the consistency of property chains as
  they are loaded.
* Add a PropertyChainVerifier implementation that logs when it finds
  duplicates.
Specify the right local effects on the optional match pipe
Merge pull request #3084 from jakub-/optional-match-eagerness

Specify the right local effects on the optional match pipe
Introduces CC check for duplicate property indexes in a given property chain

The check happens on first property checks, which then traverses the whole
 chain, recording duplicates
Adds a new report error in ConsistencyReport for the new type of inconcistency

As a note, this is a slight bending of the CC framework. It is the first check
 that requires state, whereas all previous cases required single record access
 only. Whether we change CC to accomodate this or we add a new type of "stateful"
 checks, that remains to be seen.

Moves logging for the runtime detector to be a responsibility of NodeManager,
 via an Observer pattern
Clarify default cache type per edition
Completes the IdMapper interface change

by letting InputRelationship deal with Object ids for start/end nodes.
Now it became apparent that stages 1 and 2 cannot be executed in parallel
if the IdMapper needs preparation. Put that check in and added comments
about it.
Fixes a license header
Merge pull request #3056 from davidegrohmann/2.1-cleanup-eidetic-req-monitor

[2.1] Cleanup EideticRequestMonitor
Merge pull request #3079 from digitalstain/2.1-fix-duplicate-properties

[2.1] Detect duplicate properties
ParallelBatchImporterTest should have a test for the writer factory enabled by default

Details:
 - make sure we test the default configuration in ParallelBatchImporterTest
 - refactor to allow to test all the possible configuration
 - disable the test with IoQueue due to a known issue in parallelizing I/O writes
 - make package protected the constructor used only for testing
Improved comments in doImport
Make Funnel independent from IoQueue
Improved test
Remove unused File from the WriteFactory.create

- cleanup IoQueueTest
Merge pull request #3098 from cleishm/default_cache

[2.0] Clarify default cache type per edition
Merge pull request #3096 from davidegrohmann/2.1-fix-pbi-tests

[2.1] ParallelBatchImporterTest should have a test for the writer factory enabled by default
Merge remote-tracking branch 'upstream/2.0-maint' into 2.1-maint
Move the refcard in under the manual.