[PLAT-5105] value spec message body and json writers
[PLAT-5105] value spec endpoint
[PLAT-5105] value spec rest api endpoint
[PLAT-5105] ValueSpecificationTargetForCell used rather than ValueSpecification for rest api endpoint
[PLAT-5105] depgraphs created from val spec rather than row/col
[PLAT-5146] interest rate notional not set
[PLAT-5105] depgraphs and gadgets using value requirement rather than row/col
[PLAT-5146] currency dropdown for cds
[PLAT-5166] no error thrown for arbitrary viewport definition on node changed
[PLAT-5105] value req not used for position/trade gadgets, jslint changes
[PLAT-5169] add enforce schema version to simulated examples
[PLAT-5166] grids created from depgraphs now working
[PLAT-5166] unversioned value mapping now unversion parent too. Needed for depgraphs after a structure change