Add graph y axis descriptions
Add descriptions of some x functions for graphs
Add simple graph y axis functions
Minor fixes to simple graph y functions
Initial work on data and page for graphs
Fix variable list showing 0 voyages for date variables
Successfully returned data for graphs
Add initial plotting poc
Initial display of graphs in web page
Fix graph excluding 0 and sorting graphs
Undo accidental commit of development code
Speed up graphs on large querysets, add rest of x functions
Graph axis labels, display percent in terms of 100
Initial support for multiple series
Support for multiple queries on graph, second column next to graph select fields
Full support for multiple series in line graphs
Merge develop and improve graph performance
Merge branch 'develop' into feature/graphs
Add rate of resistance to xy graphs
Add inner tabs for graphs