Bogus layers auto-removal attempt#1
Bogus Layers auto-removal attempt#2
Bogus Layers auto-removal attempt #3
Bogus Layers auto-removal attempt #4
Typo fix
Bogus Layers auto-removal attempt #5
enough type checking is enough
Bogus Layers galore
Merge pull request #140 from tobozo/bogus-layers-autoremoval

Bogus layers autoremoval :
  - More debug in product API
  - Auto-Cleanup bogus product references
  - Auto-Dump duplicates