doc fixes

Changed the C examples to return the error code in main()

some uses of PetscTryMethod() actually require that the

object is correct and the function returns an appropriate value.
Change those calls to PetscUseMethod().

a variety of corrections suggested by the clang static analyzer

Time: 1 hour

Check if Fortran allocations succeed

Thanks-to: Ondrej Certík <ondrej.certik@gmail.com>

many issues detected by clang static analyzer

Time: .5 hours

Merge branch 'barry/monitor-fromoptions'

MPI-Uni builds should not warn about unused mpiio options because MPI-IO
is irrelevent on one process. This removes unneeded nightly build warnings

Reported-by: nightly tests

Since PetscViewerAndFormat is declared in Fortran as external it
cannot have the PETSC_STDCALL in its definition.

Thanks-to: Satish Balay <balay@mcs.anl.gov>

Fix bogus C++ comment

add back in support for using default monitors for TSMonitorSet,SNESMonitorSet, and KSPMonitorSet
from Fortran by introducing PetscViewerAndFormat to Fortran

Time: .5 hours

PetscDraw: Rework implementation of PetscDrawAxis

* Fix computation of coordinates
* Draw axes as a rectangular box
* Rework computation of spaces for ticks and labels
* Add option -lg_marker_type t

PetscDraw: Rework implementation of PetscDrawAxis

* Fix computation of coordinates
* Draw axes as a rectangular box
* Rework computation of spaces for ticks and labels
* Add option -lg_marker_type to quickly set the marker type in line graphs
* Slightly update LH/HG/Bar and related tests

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PetscDraw: Use 'int' for pixel coordinates

PetscDraw X11: Fix resize window

* After XResizeWindow(), wait until the server notifies back the client,
otherwise XGetGeometry() would return outdated position & sizes.

PetscDraw: Quick fix bad types in test

Introduce PetscViewerAndFormatCreate() to partner with PetscViewerAndFormatDestroy()

Time: . 1 hours
Thanks-to: Lawrence Mitchell <lawrence.mitchell@imperial.ac.uk>

PetscDraw: Proper implementation of PETSC_DRAW_NULL

* Remove special casing of PETSC_DRAW_NULL in the draw interface
* Rework handling of PETSC_DRAW_NULL in Draw{Axis|LG|SP|BAR|HG}
* Some 'extern' -

PetscDraw: Proper implementation of PETSC_DRAW_NULL

* Remove special casing of PETSC_DRAW_NULL in the draw interface
* Rework handling of PETSC_DRAW_NULL in Draw{Axis|LG|SP|BAR|HG}
* Some 'extern' -> 'PETSC_INTERN' fixes
* Add missing error checking

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PetscDraw: New draw backend based on raster images

PetscDraw X11: Fix coordinate computations and off-by-one-pixel issues

* User coordinates in range [xl,yl]x[xr,yr] map to pixels [0,w-1]x[0,h-1]
* Simplify PetscDrawString_X()
* Simplify and fix off

PetscDraw X11: Fix coordinate computations and off-by-one-pixel issues

* User coordinates in range [xl,yl]x[xr,yr] map to pixels [0,w-1]x[0,h-1]
* Simplify PetscDrawString_X()
* Simplify and fix offsets in PetscDrawStringVertical_X()
* Fix box computation for calls to XFillRectangle()
* Implement drawing of arrow tips for horizontal arrows

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PetscDraw: Move handling of save on clear/flush to interface level

PetscDraw: Default implementation for PetscDrawStringVertical()

Fix serious bug introduced with introduction of XXXMonitorSetFromOptions() that resulting in
excessive pushes to viewer formats and caused different viewers to overwrite each others formats

Time: .7

Fix serious bug introduced with introduction of XXXMonitorSetFromOptions() that resulting in
excessive pushes to viewer formats and caused different viewers to overwrite each others formats

Time: .7 hours
Reported-by: Lawrence Mitchell <lawrence.mitchell@imperial.ac.uk>

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PetscDraw: Update help messages for -draw_save* options

PetscDraw: Refactor API for saving images/movies

* Now PetscDrawSetSave() handles saving images but not movies
* Add PetscDrawSetSaveMovie() to handle saving movies
* Add PetscDrawSaveMovie() to exp

PetscDraw: Refactor API for saving images/movies

* Now PetscDrawSetSave() handles saving images but not movies
* Add PetscDrawSetSaveMovie() to handle saving movies
* Add PetscDrawSaveMovie() to explicitly save the movie
* Enable save options for any draw subtype

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Merge branch 'barry/fix-private-functions'