add ignore of the build directory.
Merge remote-tracking branch 'opm/master'
Merge remote-tracking branch 'opm/master'
not track build directory
script for automatic updating opm/core
echo some information
Merge branch 'master' of github.com:qilicun/opm-core
Merge remote-tracking branch 'opm/master'
Merge branch 'master' of github.com:qilicun/opm-core
Merge remote-tracking branch 'opm/master'
Merge remote-tracking branch 'opm/master'
Merge remote-tracking branch 'opm/master'
Merge remote-tracking branch 'opm/master'
Merge remote-tracking branch 'opm/master'
Merge branch 'linsolver_petsc' of https://github.com/qilicun/opm-core into origin/linsolver_petsc
Fixes status message when PETSc couldn't be found.
Removes broken conditional check.

The FindPetsc module would check for a PETSC_ROOT and not attempt to look for
mpi and the petsc header if this was not set, which it in most cases won't be.
If the variable is set then the conditional include is redundant, as it will
search the explicitly passed paths first anyways.
FindPets searches default paths w/ general namings

Removed the NO_DEFAULT_PATH flag as this really isn't working for most systems
(where PETSc will be installed from a repository and in /usr or /). Path suffix
parameters extended to accept more version-less configs too, to be compatible
with a default PETSc (debian style) install.