Change submodules to local symlinks for dev
Adapt demo to latest Qoogr core, qgr-cntrl-checkbox, and qgr-graph-barchart
Add more bird data and another set of checkbox controls
Add label configuration to graph config
Use more compact array-with-metadata format for example data
Merge symlinks into master
Create additional graph of bird colors

Uses the new default Query Mapper to enable easy configuration of Mappers
for new Graphs. For filter-only controls, just extend the default and
specify a new base query tree - the default Mapper will automatically
handle inserting the filter subclauses into the AND clause of the query tree.
Merge branch 'symlinks'