Disable fparser debugging functions by default

And fix the fparser Makefile so that whether they're enabled will
depend correctly on the configure options
Fix for -Wliteral-suffix C++11 warning

In C++11, concatenation of literal and preprocessor strings requires
an intervening space so as to avoid conflicting with the new string
suffix syntax.  g++ seems to be only warning about this for now, but
let's fix it before they turn it into an error.
Detect VTK 6.0
Use AC_LINK_IFELSE instead of AC_HAVE_LIBRARY for VTK-6.0
Ran bootstrap.
Fix comparison operator.

I think you need double parens if you want to use '<' or '>' in
an m4 file.  On my system it was writing a empty file called "5".
Avoid 'No such file or directory' warning when configuring VTK-5.
Merge pull request #263 from libMesh/Wliteral-suffix

Fix for -Wliteral-suffix C++11 warning
The VTK SetInput() member apparently got renamed to SetInputData()?
We also use vtkXMLPUnstructuredGridWriter.

Therefore we must also link against libvtkIOXML.
VTK API change was already in 6.0
Update lines of code count for June 2014.
Update traffic.
Ignore warnings from VTK-6 header files.
Merge pull request #265 from libMesh/vtk6_compat

VTK 6 compatibility
fix for make installcheck
Kalashnikova, 2014 tech report.
Update traffic.
Set the FUNCTIONPARSER_SUPPORT_DEBUGGING #define.

But only if configured with --enable-fparser-debugging.
Add summary line if fparser debugging is enabled.