Document CSV file format

o add a documentation test about quoted strings and escape chars
Merge pull request #2532 from davidegrohmann/csv-file-format-docs

Csv file format docs
Fix problem about not using indexes when multiple labels are present on a node

o fix conflicts between Ronja rewriters and legacy planner
o added more index acceptance tests
o fix the legacy planner builder to make sure indexes can use values generated by unwind
Typo in changelog for 2.1.2
Removed an incomplete log message. Should be properly done at a later point
Test accessing label changes in a TransactionEventHandler.
Readme cleanup in the distribution packages.
Bump concurrent lock holder limit to 4680
Merge pull request #2541 from jakewins/2.1-locklimit

Bump concurrent lock holder limit to 4680
Merge pull request #2542 from nawroth/readme

Readme cleanup in the distribution packages.
Removes unnecessary log4j references
Remove Log4j from licensing info.
Revert "Remove Log4j from licensing info."

Revert non-urgent changes before release.
This reverts commit 311c8388219dd858ef91b080aecce6f964decb3f.
Revert "Removes unnecessary log4j references"

Revert non-urgent changes before release.
This reverts commit c504ff4620c537f6f06ab8366dfa6e2d25d5ad9b.
Revert "Readme cleanup in the distribution packages."

Revert non-urgent changes before release.
This reverts commit c3f61a633026931312437fdb2e8db5109ccacccb.
Add rewriter to transform equals for id(a), a.prop to in collection predicates
Add a rewriter for splitting IN in constants value and not constant values
Add rewriter for merging IN collection predicates when relates to the same lhs and contain only constant values
Use the introduced rewriter in Ronja

o remove code which was needed for handling equals
o cleanup on normalizeEqualsArgumentOrder