Release 0.4alpha1

Changelog:

• a completely new plugin system
• a brand new, extensible data model
• support for various storage and package backends
• implementation of additional WCS 2.0 extensions:
  • Scaling Extension
  • Interpolation Extension
  • Rangesubsetting Extension
  • CRS Extension
  • GeoTIFF encoding Extension
• WPS 1.0
• a lot of improvements in the core functionality like input/output parsing, result encoding etc.
• streamlining of the management commands
• many performance optimizations