* allow to access last operation tick of the transaction
* modify IResearchLink to rely on last commtted tick
* get rid of writing arangosearch markers to WAL
* further implementation
* local changes in iresearch
* add recovery states
* properly handle link creation during recovery
* adjust test cases
* properly handle nested transactions
* ungreylist recovery tests
* add more recovery tests
* do not use transaction to pass recovery tick
* do not store recoveryTick in MMFilesRecoveryState
* adjust tests
* fix mmfiles
* cleanup
* add context validity check
* fix tests
* fix more tests
* ensure subscription is not being released during commit
* address review comment
* final cleanup
* fix crash
* fix tests
* address test failures
* address review comments
* address review comments
* properly set recovery tick even if no recovery happened
# Conflicts:
# arangod/IResearch/IResearchLink.cpp
* Removet lazy creation ob analyzers collection. Test fixes (added explicit creation of analyzers collection for test enviroments)
* Fixed test runs. Removed cluster tests for analyzer DDL
* Analyzers collection name moved to tests common
* Disbaled load_library in normalize calls
* Legacy code cleanup
* added db analyzers collection checks in analyzer creation test to cover functions removed from gtest
* Reverted analyzer properties comparsion to non-utf8 as that must be binary equal
* validate analyzer properties, do not return `null` for identity analyzer properties
* fix some tests
* Fixed tests for new analyzer parameters validation. Added explicit test for analyzer parameter validation
* update iresearch, fix analyzer tests
* fix more tests
* fix tests
* store analyzer properties as vpack
* more compilation fixes
* Updated iresearch
* Tests compilation fixed
* Test run fixes
* Test run fixes
* Fix test run
* Fixed all IresearchTests
* Fixed V8Analyzers tests
* Added ngram and delimeter analyzers vpack config
* Added ngram and stem analyzers vpack parsers. Added tests
* Fixed internal issue #593 Fixed build issue
* Fixed tests
* Fixed Gtest tests
* Changed test run to fix Mac failure
* Mac tests debugging
* Fixed jslint errors
* test tracing added
* Taken account for VPackSlice operator== false negatives
* issue 526.3: update analyzer feature to store analyzer definitions in per-vocbase system collections
* address merge issues
* address another merge issue
Dronplane
Andrey Abramov
Dan Larkin-York
Vasiliy