PRD-4426: Don't display crosstab icon when not in expert mode
Merge pull request #16 from pentaho-skarmali/PRD-4426_make_ct_experiment_mode

PRD-4426: Don't display crosstab icon when not in expert mode
PRD-2087: Fixing a couple of theoretical cache poisoning issues where nodes that should have been relayouted after a pagebreak are skipped.
PRD-2087: Fixing a couple of performance issues with node-caching. This concludes this case.
PRD-2087: Curbing logging and paranoid checks for maximum performance.
Revert prior commit for PRD-4419