Installing tools+versions needed for a workflow

[hexylena]

When I download the workflow I want to use, I am having hard time figuring out which tools and their version are the exact ones that the workflow needs. Alternatively, each tool and version could have searchable hash codes. I would then obtain all hashes my workflow needs and installed them one by one from toolshed.

from @biomonika on trello

@peterjc notes:

When an Admin installs a workflow this seems a natural thing to offer, reusing the existing dependency interface.

When a non-Admin imports a workflow, at least providing a summary of missing workflows would be good (that could then be passed on to an Admin).

@erasche note: this had 5 +1s on trello.

[mvdbeek]

The non-admin part should be easy enough, I could do that.

[hexylena]

@mvdbeek wunderbar!

[martenson]

xref: #3626

[mvdbeek]

I think we've come a long way since then ... the workflow *.ga file now contains the exact repository details, we can install workflows including tools through the API thanks to @manabuishii and @davebx has implemented the UI in #3626