Patch file - partial support for Capital Gains US tax reporting

[J. Alex Aycinena]

I have attached a patch file to bug # 554396 in bugzilla which
implements partial support for Capital Gains US Tax Reporting using
code 673 as described in the bug.

It also corrects a minor error in how line data is displayed in the
Edit-> Tax Options dialogue.

I would be grateful if one of the developers with commit privileges
would apply it to trunk for me.

Thanks,

Alex