Reorganised EMBOSS Datatypes

Based on information from

- http://emboss.sourceforge.net/docs/themes/AlignFormats.html
- http://emboss.sourceforge.net/docs/themes/FeatureFormats.html
- http://emboss.sourceforge.net/docs/themes/SequenceFormats.html
- http://emboss.sourceforge.net/docs/themes/ReportFormats.html

The emboss datatypes were reorganised into separate categories. However, some datatypes overlap
significantly. For example, the EMBOSS `swiss` format is a sequence, report, and feature format.
This overlap could cause issues (depending on your point of view), as an EMBOSS tool producing a
"report" type output, would also depend on the sequence format datatypes.
Merge pull request #65 from bgruening/emboss_datatypes

Reorganised EMBOSS Datatypes