Add TSThetaSetTheta() and TSThetaGetTheta().

The latter only needs to be exposed to people who are hacking TSTHETA to
do something unconventional.

Hg-commit: 797407633f310edb60bd465f1862e860d49bb832

ts theta: drop superfluous recomputation of Xdot

Hg-commit: 1b0ae06942b81c85ccdbf43d3a370c754d2ffc56

a few cleanups, enhancements, and fixes for TSTHETA

Hg-commit: f4006a1b61899799189bb7230f065c388d70a761

ts theta: don't destroy vectors that haven't been created yet (from Lisandro)

Hg-commit: 49c097a144842093eae34297ecfbc09647fe2fe5

Modify TSSetPreStep and TSSetPostStep to run every step rather than once per call to TSStep.

It was not useful to place these at the start and end of the entire
time-stepping sequence (because the u

Modify TSSetPreStep and TSSetPostStep to run every step rather than once per call to TSStep.

It was not useful to place these at the start and end of the entire
time-stepping sequence (because the user might as well have called their
functions directly). With these hooks, it is at least possible for the
user to implement IMEX schemes within TS.

Hg-commit: 772bf07ee669084a0a1feeeabdadc0153e52d6da

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removed PETSC_ARCH/conf/base and
added support for not setting PETSC_ARCH and PETSC_DIR with --prefix option

Hg-commit: e478f4df238e5763b64567336d7cf94ca5d89d58

doc fixes, WRMS norms, TSGL_DI schemes

Hg-commit: bbbc495383d0f1841eced6a7dae66527a1153f32

typo

Hg-commit: 307f177240227e30cba243c92bbbb4180c905184

Fix implicit function eval when RHS is given, make extrapolation optional

Hg-commit: 617ea9a92e26a1aff1b7fbec73aef7fd31ad340a

TS_THETA mods for -snes_mf_operator

Hg-commit: fccf682beffced9c564c7a7b77e618aec5cfa75c

Implicit formulation in TS, TS_THETA

TS: Adding support for implicit form F(t,X,Xdot)=0, suitable for DAE

TS_Theta: Implementation of theta integrator cast as a 1-stage
Runge-Kutta method which use

Implicit formulation in TS, TS_THETA

TS: Adding support for implicit form F(t,X,Xdot)=0, suitable for DAE

TS_Theta: Implementation of theta integrator cast as a 1-stage
Runge-Kutta method which uses the implicit form and thus may be applied
to DAE.

Hg-commit: 59bd09a7bf51ba2c479750c1f2cadaf645713178

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