updates from online alignment stack

• change threshold for VP half alignment updates
• add SciFi alignment analyzer and iterator options
• add VP module alignment analyzer and iterator options
• add VP right half alignment analyzer and iterator options
• AlignOnlineIterator improvements
  • sleep before reading derivative files to make sure they have been produced by all Analyzers
  • first push constant update before merging histograms
  • more fine-grained decisions if constant update is required
  • produce monitoring plots at the end