Added Maven target for appending new samples

Use 'mvn -DQtiSampleImport exec:exec' to merge most new samples
into whatever is already there. It's not very clever but works OK.
This is less destructive than 'SchemaSetup'.
Added 'support' directory for local SQL/scripts
Helpers for M1->M2 & post-pilot data migration.

This is only of interest to David. I've committed this here
for posterity and will remove immediately afterwards.

The migration from M1->M2 involved a big DB schema change, as well
as a merge of the test data Sue Milne had deployed to dev for the
test piloting in December 2012. That makes it all a bit complicated!
Removed M1->M2 migration files