Remove the last of the use of horizontal lines --- as seperators. With modern code development systems they are not needed and just an eye-sore

Add automatic generated fortran support for setting and returning contexts

Major cleanup of the code for setting and returning application (previously called user) contexts
- PetscCtx ctx is now t

Add automatic generated fortran support for setting and returning contexts

Major cleanup of the code for setting and returning application (previously called user) contexts
- PetscCtx ctx is now the standard for passing in contexts
- PetscCtxRt ctx is the standard for passing out contexts, including context destroy routines based on PetscCtxDestroyFn

Both of these are typedef to void*

Also removed most use of user and userctx for context arguments now consistently named ctx

Improved documentation on PetscCtx and PetscCtxRt and on how to use contexts (including getting them) from Fortran

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checkbadSource: enforce proper style in makefiles

Introduce PetscFortranCallbackFn to be used instead of PetscVoidFn for Fortran callback functions

Also fix incorrect use of SNESFunctionFn and SNESJacobianFn in SNES Fortran manual stub

Change use of void (*)(void) and void (**)(void) in the PETSc API to PetscVoidFn * and PetscVoidFn ** or PetscErrorCodeFn * or PetscErrorCodeFn **

Convert some SETERRQ() to PetscCheck()