Pdi creation (rebased onto develop)



This is the same as gh-1525 but rebased onto develop.

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In this PR, we review the P/D/I creation options 
See https://docs.google.com/presentation/d/1ygtNV1RxoaGyyQ-ZSJ1x5_3ZLsETNU7otmNWnHcxQeM/edit#slide=id.p15
and https://trac.openmicroscopy.org.uk/ome/ticket/11048

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Rework menu 
Before
![right-clickmenubefore](https://f.cloud.github.com/assets/1022396/1171320/37e6a980-2102-11e3-85d4-260cccc1fb46.png)

After
![right-clickmenuafter](https://f.cloud.github.com/assets/1022396/1171322/3cf34b86-2102-11e3-8207-8951dc40d3b4.png)

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If validated, the screenshots for the training doc will have to be updated