More metadata goodness!

[John Wiegley]

Just added a new feature to better improve 3.0's use of metadata:
There are now "tag/pop" directives, to apply metadata to a range of  
transactions (and their postings).  For example, if you wanted a  
conceptual "page" of transactions relating to business trip to  
Chicago, you could do this:

  tag Location: Chicago
  tag Purpose: Business

  ... transactions go here

  pop
  pop

It would be as if you'd applied "; Location: Chicago", etc., to every  
transaction.

John