Added new option --inject=KEY[,KEY...]

If you have a typed metadata key which contains an amount, you can use
--inject=KEY to inject a posting with that amount wherever a match
occurs.  There are two main forms of usage:

  2010-06-18 Sample
      ; Key:: $100
      Expenses:Food                $100.00
      Assets:Checking

The command would be:

  ledger reg --inject=Key

In the above, transactional form, a posting under the account "Key" will
be injected before the first posting reported for this transaction.
It's amount will be $100.  This only happens once for the whole
transaction.

It is also possible to associate the key with a posting:

  2010-06-18 Sample
      Expenses:Food                $100.00
      ; Key:: $100
      Assets:Checking

Now the injected posting is generated whenever that particular post is
reported.

1 files changed, 1 insertions, 0 deletions

diff --git a/src/report.cc b/src/report.cc
index 9626283a..da7c11f5 100644
--- a/src/report.cc
+++ b/src/report.cc
@@ -955,6 +955,7 @@ option_t<report_t> * report_t::lookup_option(const char * p)
     break;
   case 'i':
     OPT(invert);
+    else OPT(inject_);
     break;
   case 'j':
     OPT_CH(amount_data);