Added report query modifiers: for, since, until

Now instead of ledger reg expense -p "this month", you can say:

  ledger reg expense for this month

And as a shorthand for "for until this month", you can just say "until
this month" or "since this month".

1 files changed, 1 insertions, 0 deletions

diff --git a/src/report.h b/src/report.h
index fc2fc1a2..59a632e6 100644
--- a/src/report.h
+++ b/src/report.h
@@ -126,6 +126,7 @@ public:
   }
 
   void normalize_options(const string& verb);
+  void normalize_period();
   void parse_query_args(const value_t& args, const string& whence);
 
   void posts_report(post_handler_ptr handler);