Issue #972 - Polishing DPF xsd schema
Potential NPE in MaintainContributionsView
minor tidying & comments to XSD
refactor to reflect updated attribute name
clarify content of sensor elements
Merge pull request #980 from pecko/issue972a

Issue #972 - Polishing DPF xsd schema
first working version
make vessels point the right way.
fix compiler warning
Merge pull request #986 from debrief/issue985_symbols

Issue985 symbols
increment versions
Merge pull request #987 from debrief/Release_20141203_3.3.303

increment versions
avoid NPE
fore forecast calcs on straight legs, don't just use the single value, provide all of the errors, we need them for the state graph.
Merge pull request #988 from debrief/hotfix_stacked_areas

Hotfix stacked areas