[Users] w_lorentz factor in TOVSolver external.inc

[Roland Haas]

Hello all,

>> After looking at the equations carefully yesterday, I would strongly
>> suggest that you apply your patch to all definitions of w_lorentz_2 in
>> external.inc. The equations there do follow the Valencia formulation as,
>> for example, it appears in eqs. 26 and 27 of Font et al's paper
>> (gr-qc/9811015).
Attached please find an updated version of my original patch that 
hopefully catches all occurrences of the Lorentz factor.
Bruno, Frank: does this look ok to you?

> You could add comments to the code, either to the definitions of these 
> variables or to the overall README.  Pointing to literature in the code 
> will help future readers a lot.
I added the references and definition to param.ccl and some notes to the 
code.

Ok to commit?

Yours,
Roland

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