Install conda packages at install-time

[mvdbeek]

@bwlang and me have decided to check if we can

• trigger conda installation when installing from the toolshed (as opposed to when first running the tool).
• display the resolver status (seems to already work partially in current code-base)

The API endpoint already works, although strikingly a GET causes the dependency to be resolved and installed.
r = requests.get(url+"/api/dependency_resolvers/0/requirements", params={"key": your_api_key, "name": "bowtie2==2.2.8"})

One difficulty here is that the tool shed takes the dependency information (or requirements) from the tool_dependencies.xml file (which I guess will be phased out in new tools at some point).
So if we want to do that nice "Install dependencies / requirements " the toolshed should probably return the requirements from the tool xml.

And indeed, the toolsshed does already provide that information through the API
r = requests.get(ts_url+"/api/repositories/get_repository_revision_install_info", {"name":"msp_sr_readmap_and_size_histograms", "owner":"drosofff", "changeset_revision":"d6b93af0da55"})

[bgruening]

Awesome! Thanks on working on this. One missing piece less :)

[mvdbeek]

@bgruening sure, let's use the momentum!
@bwlang this is the reponse from the TS

[mvdbeek]

API call to display all resolved dependencies:
pathspec = "/api/dependency_resolvers/requirements"
requests.get("%s/%s" % (url, pathspec), params = {"key": key}).text