- Added a -i option to the bnd diff command for ignore headers
- Made the diff ignore an Instruction (wildcard, rejection)
Made the baseline and diff command work better with
a project. If no arguments are specified, the project
can provide the newer and older jar. Notice that a
project can have multiple sub-builders, that is,
you might get multiple results. Also added
a few options, see bnd help diff and bnd help baseline.
Performance, only set diffIgnore when baselining
is used.
Made the header ignore use instructions so we have 
wildcards.