Assigns default memory size for relationship group store

The default size is 10M (or 0.03% size of nodestore if the size is allocated by AutoConfig)
Tagging for version 2.1.6
Fix carousel step arrows getting cut off.
Wrap propertyKeys in a div for better compability.

- Fixes the text overflow error of labels in Safari.
Updated auth docs for defaulting to enabled together with some more structure.
Back to development version.
2.1.6-SNAPSHOT -> 2.1.7-SNAPSHOT
Add support for server authentication in Neo4j Browser

- Browser exposes authentication and uses authorization if needed.
- Set of new :server commands are now available, along with documentation for such.
Import tool recognizes 'TAB' delimiter as tab character
Import tool prints errors to System.err
Less confusing docs for terminating transactions.
Show a selected state on captions in inspector.
Let node resize circles sizes indicate their actions.
Change auth to on by default
Cleanup user serialization format a bit
Merge pull request #3552 from nawroth/terminate

Less confusing docs for terminating transactions.
Merge pull request #3519 from jakewins/2.2-authon

Auth on by default
Merge pull request #3532 from nawroth/auth

Updated auth docs for defaulting to enabled
Merge pull request #3493 from S124568/2.1-add-MMIO-setting-relgroupstore

Assigns default memory size for relationship group store
Merge branch '2.1-maint'