2019-01-06 meld 3.20.0

Fixes:

• Add Enter as a Compare accelerator in folder comparisons (Kai Willadsen)
  

• Change entry and drag-n-drop file changes to confirm discarding modified
  files instead of offering to save, for simplicity (Kai Willadsen)
  

• Fix menu sensitivity in folder comparisons (Kai Willadsen)
  

• Avoid dconf writes of no-op window size allocations (Kai Willadsen)

• Issues fixed: 247, 262

Translations:

• Emin Tufan Çetin (tr)
  
• Milo Casagrande (it)
  
• Rafael Fontenelle (pt_BR)