Move tests out of the source tree
Use path references from the root of the project

This means that it becomes harder to move this directory around, but
that gain is relatively small anyway. It is however necessary to do
this if we are not going to do a recursive build style.
Import cmake/ from commit 5f82198c in opm-core
Remove opm-core specific customizations
Search and replace opm-core with opm-upscaling

Add dependencies that are specific for this library as well as doing
the textual replacement in the configuration file.
Ignore output from CMake build
Remove remnants of the Autotools build system
List files that are needed to build the library

This list will be picked up by the modules at a later commit.
Specify source files explicitly rather than with glob
Various improvements in the build process

Allow uppercase alternatives, fix whitespace bug, allow empty pre-
compiled header, find OpenMP
Only regenerate config var file if actually changed
Remove make execution wrapper
Merge pull request #28 from rolk/028_cmakeupd

Update CMake scripts to commit 11bf7bf3 from opm-core