Use sam_fa_indexes tool data table instead of searching the dbkey in sam_fa_indices.loc

Also remove some unused imports.
Use sam_fa_indexes tool data table instead of searching the dbkey in sam_fa_indices.loc also in Cufflinks wrappers
Add new loc file for SAMtools indexes to support genome variants
Fix mysql index length in migrate 0014.
Add mysql_length to TEXT index in to migrate 0017
Fix migration 0030 for mysql, slug index length
Fix migration 0032 for mysql -- specify index length
Fix index creation for mysql in 0054
Create indexes in migration 0035 manually to supply mysql_length.  After this changeset, mysql instances can migrate from scratch though there are still a few more issues w/ column dropping.
Merge
Refactor logic in migration 0032, fix sqlite duplicate index.
Fix toolshed migration 0017 to work with both postgres, postgresql dialect names
Remove print statements from api/search, ctrl/visualization, ctrl/workflow
Fix reports import issue reported by Lance, https://trello.com/card/bug-in-reports-webapp-imports/506338ce32ae458f6d15e4b3/943
Adding new branch for export support of published_workflows
Add support for exporting published workflows directly from the main '/list_published page'
Removing optional arguments from export_to_file as it was not required from the last commit
Fix for handing comments as the last element in a set_environment tag set in tool dependency definitions.  Contributed by Adam Novak.
Changing 'export' text
Fix for loading workflows with complex ToolShed Repositories dependencies.