Add VecGetSubVector and VecRestoreSubVector and test

VecNest will implement this interface

Hg-commit: eed11e97b1e3a27003b34b493491e2b849c3e0e4

Consolidate VecNest and mark all the private functions static

Hg-commit: 7fd259f0d2f15bbd84d00d6939e44378f9bd7d15

Rename VecBlock to VecNest

Hg-commit: 553ca9a6566d8ea570415cc833c6242bcd4c9fa3

removed VecGetArrayPrivate3() and VecRestoreArray3() since they are not needed, just call the get and restore individually

Hg-commit: 1bd6e50d039c688a8c6b1d0518b58b766ad29a0d

Use only C-style comments

Hg-commit: 1d9a053a6484a0aaaaa525697c8a5ded887b0594

Don't export a couple private functions

Hg-commit: fef771a4ebdd3c895f4aca19c4e957a3e1601ef6

More formatting conventions

Hg-commit: 1efac096b7243d281577c75c27761944482f6208

More naming and consistent PetscFunctionBegin

Hg-commit: 98b15a4ba444a7cecd66cd7f9ebfd436e869cc39

Identifiers cannot start with a double underscore

Hg-commit: ddfa31dd0bae50f2ea6b78164bf4daa43db3c7f5

consolidate consistency checking into macros so the line numbers will be more representative

Hg-commit: eaefa5a3f8cd7ae975303d9680e8e587f309728a

Formatting and coding conventions in VecBlock

Hg-commit: e6d4dbfd8ffdc60560175595942e11053fd1f059

commit after merge

Hg-commit: 9122b9cb4bbbe7a3aa70181d1e1d574ba50c62ae

removed VecGetArrayPrivate2() since no longer needed

Hg-commit: 5da56ab6870991e13da18b67c87201c067246f42

Formatting and fix compilation error because EXTERN_C functions were not declared

Hg-commit: 00c8d0fea1b972655d8da16741709ae1eb3bf7e1

Merge DMComposite work

Hg-commit: 190ef40b489f79a42d838f20330ea5e818e21312

ISSetBlockSize_Stride needs to set is->bs

Hg-commit: 9cb3a14dfcb08af23e98be1334a9cf6c4dfa67a5

Removed the usage of "block" and replaced with VECBLOCK.

Hg-commit: 025a65c1a13e3bf9df032838addf5f29a49606c6

Added a test file, and two tests for the Vec block implementation.

Hg-commit: bc9a9786b600aff7325d8acdabc9edc2175eb65e

Added the Vec implementation "block".

Hg-commit: 0f040ebc980824f51d95b1b58eebf2f8452a83d9

VecScale_Seq should use VecGetArrayPrivate()

Hg-commit: 7905767079e6ec97ea77fba44e0255ad3fde38fb

added Katz pubs
fixed some VecGetArray() usage

Hg-commit: 00a8b50cf3fbeae86aabc3b9498ef31385d98b84

Add ISLocalToGlobalMappingGetIndices()

Hg-commit: eea7cc64a88fc9a2e3c83f2e385f95d1e1305e39

Change ISBlockGetBlockSize to ISGetBlockSize, add ISSetBlockSize

Hg-commit: 0a222ea1e9a192436a7e4681121fe012f4928844

added VecCUDAGet/Restore things (just framework, not yet used)
commented out setting number of cycles for sacuda (does not work yet)

Hg-commit: 442aa5908a6623001343cdab0b4b235874a717db

stripped VecView for CUDA since it's not needed
switched sacuda to apply with multiply

Hg-commit: 2fbeeabe7055701fef69f0d148ab87b9a6a3885c