Delete OM-RA-Backlog.xlsm

Remove this file from tracking.
Refine the logger to show details during cross checking
Refactor and add FB target checker
Check for latest FB  if there're multiple plans with different targets.
Refine predicates to exclude done/obsolete features.
Refine the filter for FBP to exclude done/obsolete features.
Merge branch 'master' of https://github.com/skyscribe/BacklogGenerator
Merge branch 'master' into develop