SNES ex13: Fix PC

build: fix -DPETSC_SKIP_COMPLEX

Reported-by: "Taller, Daniel" <taller1@llnl.gov>

Remove need for seperate lib/petsc/conf/test file by merging with rules file

Commit-type: maintainability

SNESNEWTONTR: stol should be zero, since we use the trust region parameter

SNESNEWTONTR: add support for NPC and sufficient decrease

add tests

SNES: support Application context in python code

We keep a global registry for contexts set via Python and cast to object only if SNESGetApplicationContext returns a void* in the set
Otherwise, we r

SNES: support Application context in python code

We keep a global registry for contexts set via Python and cast to object only if SNESGetApplicationContext returns a void* in the set
Otherwise, we return the address

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Add implementation of 4th-kind Chebyshev polynomial smoother

SNESNEWTONTR: add dogleg and Cauchy fallbacks from NTRDC

minor

Remove empty preprocessor variables