if saws not defined then petscviewer was not defined

Remove --with-dynamic-loading / PETSC_USE_DYNAMIC_LIBRARIES

This option was mostly redundant because normal shared libraries satisfy
all the same needs. This commit adds the run-time option
-dynami

Remove --with-dynamic-loading / PETSC_USE_DYNAMIC_LIBRARIES

This option was mostly redundant because normal shared libraries satisfy
all the same needs. This commit adds the run-time option
-dynamic_library_preload that can be used to load/initialize all the
packages in advance, as used to be done when --with-dynamic-loading.

The PetscDLLibraryRegister_petscxxx functions have been kept, but are
not called unless -dynamic_library_preload is used. The petsc-dev
discussion, "Why --with-dynamic-loading?" did not reach consensus about
whether this was ever useful, so it may also be removable.

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updates to allow saws to display graphic results from application (crude)

converted uAMS usage to SAWs usage; starts server but cannot see any published directories

completed allowing generating graphics with Xvfb, works with AMS

add -draw_save_single_file to recycle same file for saved images

removed unnneeded and unused XXXRegisterDestroy() routines

removed PetscFunctionListDestroyAll() and put PetscFunctionListDestroy(&XXXList) into the package finalize

PetscFunctionListAdd: use macro to hide (PetscVoidFunction) cast

Same rationale as the last commit:

Casting using PetscVoidFunction instead of (void(*)(void)) is needed
with C++ compilers that will

PetscFunctionListAdd: use macro to hide (PetscVoidFunction) cast

Same rationale as the last commit:

Casting using PetscVoidFunction instead of (void(*)(void)) is needed
with C++ compilers that will not implicitly convert C++ language linkage
to C language linkage. Since PetscFunctionListAdd() is meant to operate
on generic function pointers, we hide this language linkage detail
(which is inconsistently implemented) in a cast.

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PetscFunctionListFind: use macro to hide (PetscVoidFunction*) cast

Casting using PetscVoidFunction* instead of (void(**)(void)) is needed
with C++ compilers that will not implicitly convert C++ lang

PetscFunctionListFind: use macro to hide (PetscVoidFunction*) cast

Casting using PetscVoidFunction* instead of (void(**)(void)) is needed
with C++ compilers that will not implicitly convert C++ language linkage
to C language linkage. Since PetscFunctionListFind() is meant to operate
on generic function pointers, we hide this language linkage detail
(which is inconsistently implemented) in a cast.

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removed string version of function name for XXXRegister(), PetscFunctionListAdd() and PetscObjectComposeFunction()

removed path and MPI_Comm arguments from PetscFunctionListFind/Add()

removed path argument to XXXInitializePackage() and XXXRegister()

removed XXXRegisterDynamic() but kept the APIs for everything else underneath the same
phase I of the update to handling registering function pointers

changed AMS publishing to use the Viewer model
added simple AMS viewer for mat,ksp,snes,ts
added --ksp/snes/ts_view_pre for starting the viewer before the solve (ugly but useful for AMS)
added PetscS

changed AMS publishing to use the Viewer model
added simple AMS viewer for mat,ksp,snes,ts
added --ksp/snes/ts_view_pre for starting the viewer before the solve (ugly but useful for AMS)
added PetscStackCalls around AMS function calls when appropriate (note do not want these in webserver because do not webserver stopping just because AMS server is down

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work on AMS interface, consistent naming, ams.h not included in petscviewer.h, no ifdefs

Hg-commit: 642571a1dc7109fdb7e5b0abb23bf260d10eb970

Change all PETSC_EXTERN_C to PETSC_EXTERN

Hg-commit: 8d2ebbb193fb583bccc64015e35640c4e08c3426