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

fixed afterimage -draw_save for X support to use new asvisual for each image rather than reusing one which may be from the wrong drawx->disp previously
added -x_virtual support to start and use Xvfb

fixed afterimage -draw_save for X support to use new asvisual for each image rather than reusing one which may be from the wrong drawx->disp previously
added -x_virtual support to start and use Xvfb instead of regular X server (note that colormap is no working correctly it seems)

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logging memory now credits to all ancestors

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

Merge branch 'master' into barry/ams

Conflicts:
include/petscviewer.h
src/sys/classes/viewer/interface/viewreg.c
src/sys/threadcomm/interface/threadcomm.c

Warnings: clean compile with gcc-4.8 at -Wextra -Wno-unused-parameter

* Mostly fills out some ops struct declarations. Reformatted so Emacs
can help with alignment. Squelch whitespace in diff to s

Warnings: clean compile with gcc-4.8 at -Wextra -Wno-unused-parameter

* Mostly fills out some ops struct declarations. Reformatted so Emacs
can help with alignment. Squelch whitespace in diff to see useful
changes.

* Use struct instead of casting to data pointer (void*) when serializing
function pointers.

* strcasecmp is in strings.h

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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