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

Hg-commit: e478f4df238e5763b64567336d7cf94ca5d89d58

TS_SSP docs

Hg-commit: 8c1095b81bce0dbb6256d0567ff3284e8cc4c908

Implementation of optimal explicit strong stability preserving integrators.

These are important for high-order TVD schemes.
Added example 1D finite volume solver, for testing TS_SSP.

Hg-commit: ab8

Implementation of optimal explicit strong stability preserving integrators.

These are important for high-order TVD schemes.
Added example 1D finite volume solver, for testing TS_SSP.

Hg-commit: ab85ee469e7163773c68d394f656fbafdd66030c

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