Merge of gc resistant cache into 1.6-maint

(cherry picked from commit 2814eee6fac2b1f5d7c17dbbc1a49273ff50a463)

Conflicts:

	kernel/src/main/java/org/neo4j/kernel/impl/transaction/ReadOnlyTxManager.java
	kernel/src/main/java/org/neo4j/kernel/impl/transaction/TxManager.java

(cherry picked from commit 84648b6d86be1e4c6895fa56123d67e67fa50503)

'dbinfo' command able to print array values too, and everything comes back as JSON for convenience if used from scripts or similar
(cherry picked from commit dbce7da4e64df793ffa6434a43b59334751bd4f4)

Increased the cache find threshold because it's still cheaper than reading loads of entries from the log
(cherry picked from commit 299e949353fbf888e9a82faa9ce19cbd5f020a52)

Added test for Start entries checksums equality and in that process fixed an issue with the current implementation
(cherry picked from commit 9623fbfa7a978b22408ec0b4152741a921052157)

Conflicts:

	kernel/src/test/java/org/neo4j/kernel/impl/transaction/xaframework/TestTxEntries.java

Uses a combination of Xid and masterId/myId as checksum instead of just timeWritten to make a transaction start record truely unique. This will allow for better branch detection
(cherry picked from commit 4489cf7be4205782c54edf98a1bd84144e1d3d13)

(cherry picked from commit 4cc35ad05a324cd45c08a776a3845c07e7bb7d7f)

(cherry picked from commit bd18c3cbda4a22196b521317959b7668422a8052)

the first active transaction would be ignored when copying over active transactions to the new log.
Now it pulls in any START/COMMAND records for such transactions right before the COMMIT/DONE record.
(cherry picked from commit 993fb2870c56241df4f30bf2e64ade52fcb5c5b6)

Found and fixed a data race issue between threads removing the same property while the node is evicted from cache.

Removed assertions that made the test fail

(cherry picked from commit 692d80e348b7a18f0408f201ba9a75757c4d1092)

Fixed a problem where copying over active transactions to the new log (when rotating) would accidentally mark all copied transactions as active again, by putting them into xidIdentMap. This would completely mess up the next rotation in that virtually all transactions would have to be copied, filling the new log immediately. Fixed by only putting in xidIdentMap if it already was active
(cherry picked from commit bbd43184394e0671feb2d75ffef3853e49643a30)

Makes sure no half transactions gets included when copying over unfinished transactions to the new log
(cherry picked from commit 76cc3cb32d7cfdc03498d4219233fbdf1596b11e)