Added degradTraj() method

instead of degrading the IC and then integrating
(which gives a very different result!)
observations dump() and load methods
Removed setMinimizer and added JMinimum class

JMinimum class is contains the result of a
minimization.  Is is more portable that way.
Correction to jTerm
Incorporated the trivial term in precondJTerm

No need anymore to add TrivialJTerm and operate
on the analysis with B_sqrt to bring it back to
normal space.