Merge pull request #4 from thehyve/london_hackathon

London hackathon merge of oracle updates to match postgres
Merge pull request #5 from thehyve/london_hackathon

London hackathon
improved matching of columns for date, numeric, not null
matched sequence, trigger names
Merge pull request #6 from thehyve/london_hackathon

London hackathon
Merge pull request #7 from thehyve/london_hackathon

London hackathon
Reduce length of varchar field

5000 characters long varchar is not allowed in ora