configure: handle paths with spaces in getExecutable(). Now the following works:
'--with-mpiexec=/cygdrive/c/Program\ Files/MPICH2/bin/mpiexec -localonly',
Merge branch 'balay/configure-space' into maint
badly formatted /*I  "include" I*/, unused variables fixed that compile with MATLAB
fixed src/dm/examples/tutorials/ex7.c to use replacement for PetscViewerBinaryMatlabOpen()
also needed to fix bin/matlab/PetscBagRead.m for new location of bagimpl.h
and put bagimpl.h into the appropriate public place