XML workflow import/export; initial dataset object export; multithreading support for app workers
Multi-threading in workflow - Individual apps can now run their processing in a separate thread and return control to the UI
- Threading implemented in a number of plugins with largest wait time
- Loading of workflows now doesn't auto-load data; speeds up and prevents pointless churning
- Needs implementation of hierarchical blocking (1->2->1 should allow multithreading on 2, but block 1 til both inputs ready)
Centralised threadpool, optimised for max threads; updated descriptive text
Move all incomplete plugins out of the main plugin tree

- All unfinished/stub plugins moved to external repos for inclusion as external
  plugins until complete/stable.
Rename all plugin definition files from .yapsy-plugin to .metapath-plugin
Implementation of plugin add/remove and upgrade system using getmetapath.org site
Implement basic plugin caching mechanism to speed up data requests (used by Zeitgeist plugin)
Add docs folder
Enable autodoc for developer documentation (for plugins, etc.)
Debug windows basename
Debug windows basename
Fix path finding for script folder
Fix path finding for script folder
Fix path finding for script folder
Fix file:/// urls to use three slashes not 2
Fix for svg paths file:///
Fix for svg paths file:///
Fix for svg paths file:///
Change the baseurl on setHTML to file:/// to avoid security restriction accessing local files (?)
Fix slashes in css for Windows