[petsc-dev] Line search routine duplication

[Peter Brune]

The line search routines exposed through petscsnes.h (SNESXXXLineSearch and
ilk) live in src/snes/ls are dependent on the private context of the ls
newton method.  This seems to have caused a fairly large degree of code
duplication of useful pieces in ls, picard, and qn.

Would moving all of these somewhere else and removing their dependency on ls
specific solver context be a reasonable course of action?

- Peter
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