Added LineSearchShell and enough interface to write Shells well.

Hg-commit: bcbb45ee42ee1592b5598ef5e7174cd0391697da

Added the critical point (cp) line search

Hg-commit: 996e2986f4f54ed57c7d88d6bcd0efa3c350ac72

Small additive FAS fix

Hg-commit: 5791a4ceb4dfca8029d32a19a390ec03d42b5160

FAS LineSearch update

Hg-commit: 8ba85f819fb604bc5719c1ea935ecdaae6537e25

Added new line search variants to ngmres.

Hg-commit: 20325ea8fb47573e36865a10789a3c0c04d07956

First crack at adding comprehensive LineSearch objects to SNES.

Hg-commit: 5d4c4dee0f60ddbc6ca02bd6d0b7e262bffb5bac

merge SNES/DM refactor

Hg-commit: 31d66a4917111e3b9e87bf19170c2c9421b4e8be

Refactor SNES DM infrastructure

The residual and Jacobian function pointers are now stored in a managed
context on the DM. Coarsening of this context is handled by a
DMCoarsenHook, so the coarse lev

Refactor SNES DM infrastructure

The residual and Jacobian function pointers are now stored in a managed
context on the DM. Coarsening of this context is handled by a
DMCoarsenHook, so the coarse level DM automatically has function
pointers for residual evaluation. The SNESDM context (attached to a DM)
has copy-on-write semantics for all DMs other than the one it was
originally created on. That means that changes to the function pointers
from the fine level are automatically propagated unless a coarse level
is changed manually.

Hg-commit: ce0066853e1ef4402603a33070cb3bfd75c87f86

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Fixed interaction of QN and Jacobian weighting in the case of restart.

Hg-commit: 42be6c8c36095dbbe2d81d8389843aed1ada6846

Added lagged-jacobian and line-search weighting to the initial inverse Jacobian in QN.

Hg-commit: b27935e86d42cf1ef02c71c5239ae48ba90dcb62

Fix some compilation errors on Cygwin

Hg-commit: fd97cbc27dcc1af33b9a7181f9bf9744b366e0c5

Changed the name of "secant" line search to the more accurate "critical"

Hg-commit: 8c0d6f59a1049c232aff6f95855cf0b66563b9c4

Doc fixes; C89 fixes.

Hg-commit: e9678e13156d153058f5d073eeedcf07290aa602

options fix for QN

Hg-commit: 997d24f6def798c02967875b49f33b261ed28215

more composition work on QN and NCG

Hg-commit: c3d0903ad0ab1eec40367f9679499a3caaed6770

one more small fix to NCG preconditioning

Hg-commit: d64384d9d55dd9804d7247aaf989e9d9df229a2b

DM computes variable bounds for SNESVI.

Hg-commit: ce166067903bacf34e561bc2e6893236d6c213a7

NCG preconditioning fix, FAS options fix

Hg-commit: 80373b530f4989bfa9f0214836e94c52faec80c0

added option for Anderson Mixing variant of NGMRES

Hg-commit: 572236611345f8734a03575271057f4a906a6809

merge

Hg-commit: 6139c3de79f9d74a80e024c910f044204214f925

Remove SNESRestrictHookAdd() and associated unaintainable design, move to DM

The coarsening hook is called when a coarse level is first constructed.
DMRestrict() is used to update auxiliary informat

Remove SNESRestrictHookAdd() and associated unaintainable design, move to DM

The coarsening hook is called when a coarse level is first constructed.
DMRestrict() is used to update auxiliary information on coarse grids.

Hg-commit: 121984cbeafd368f2685a0e7485337133d3b8922

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added SNESLineSearchApply(), SNESLineSearchPreCheckApply() and SNESLineSearchPostCheckApply() to the interface

Hg-commit: 2c13a8e4d8b8ac5f9278109127dbdacc4d0d6da6

added SNESSetFunctionNorm and SNESSetIterationNumber to make SNESShells easier to write.

Hg-commit: 35d4b2bf7a9aec9ffb7973f65f13044a16facf27

more QN robustification

Hg-commit: 5084da17ac849498ab4e5877ab12a389c2d655f8

complex fixes for new QN.

Hg-commit: 69bd9b0b14742ebcf40ca485678efc4c490b8b71