[math] JAMA update and options

[Phil Steitz]

I have gone back and forth a few times with one of the JAMA developers 
at NIST (Bruce Miller) and legal-discuss and have finally asked the ASF 
board for a ruling on whether or not we can start pulling in some JAMA 
code. I wanted to start with the QR class, so we can use that to get 
multiple regression implemented with decent numerics.

Before we start down this path, though I want to present some logical 
alternatives and get others' reactions to them.  Rather than pulling in 
bits of implementation code, we could

1) Introduce a jar dependency on JAMA and wrap / extend / directly use 
the stuff we need.  For the QR use case, there will be no performance / 
efficiency hit from this. For some of the other RealMatrix uses, this 
might be tricky.

2) Bring in the full code base.  This would probably result in a side 
trip through the incubator and might provide the occasion to get us 
kicked out of commons (I am sure there are some who will be happy to see 
us go :-) but that might be a good thing.  I don't know yet if the JAMA 
guys would go for this, am interested in opinions of others here.

If I get the go ahead from the board, we will need to decide between
0) fork selected stuff into [math] and pass bug fixes back and forth 
with JAMA

and 1) or 2).  WDYT?
Note that the same considerations apply to RngPack.
Phil
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