Make ronja pipes avoid unnecessary copies of execution context maps
Refactor IdSeekIterator
Increase the test timeout for PageCacheTest#rewind…
Avoid object creation in Pipes
Merge pull request #3089 from chrisvest/2.2-pc-rewind-timeout

Increase the test timeout for PageCacheTest#rewind…
Merge pull request #3087 from boggle/micro-ops

Cypher performance optimizations
Evict from cache as late as possible in race test.
Exact number of relationships given node label.

The CountsStore maintains the exact number of relationships in the
database that either starts or ends in a node with a given label. Counts
are maintained both in total, and by relationship type, but only for one
label, i.e. number of relationships that starts in a node with a given
label and ends in a node with a given label is not maintained.