TSROSW: Various fixes and enhancements

* Eagerly set default type.
* Refactor accept/reject and rollback.
* Fix setup and reset when changing type.

TS: Fix TSView() for TSTHETA and TSALPHA to view the TSAdapt context

TS: Fix function declarations and visibility

* Most of these fixes where spotted by GCC -Wmissing-declarations

TS: Move calls to TSPreStep() from implementation to interface

* Make the semantics symmetric with TSPostStep()
* Handle rolled back steps appropriately
* If a callback is ever needed to run at the

TS: Move calls to TSPreStep() from implementation to interface

* Make the semantics symmetric with TSPostStep()
* Handle rolled back steps appropriately
* If a callback is ever needed to run at the begining of each TSStep()
(including rolled back steps and step rejections), we can add a new API
to support this particular need (BTW, patches welcome!)

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Merge branch 'maint'

ts: add a more complete error message for methods that do not have embedded counterparts and are used with ts_adapt

Reported-by: https://bitbucket.org/petsc/petsc/issues/121/non-embedded-rk-types-gi

ts: add a more complete error message for methods that do not have embedded counterparts and are used with ts_adapt

Reported-by: https://bitbucket.org/petsc/petsc/issues/121/non-embedded-rk-types-give-unhelpful-error

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Merge branch 'hzhang/inode-erroriffpe'

fixed up formatting of references in manualpages to consistent style

References:
+ 1. - ref1
. 2. - ref2
- 3. - ref3

previously the formatting was varied and ugly

add allowzeropivot and zeropivotdetected to PetscKernel_A_gets_inverse_A_#

rename crash and wouldcrash -> allowzeropivot and zeropivotdetected as suggested by Barry

add 'PetscBool crash,PetscBool *wouldcrash' to PetscKernel_A_gets_inverse_A_3() to handle zeropivot error

Begin renaming the PetscOptions objects for the future where PetscOptions will not be a singleton