If there is a sibling directory with the name of the module we are
searching for, it is probably part of the same suite, and is the
version we intend to use, before the system version.
This behaviour can be altered with the option SIBLING_SEARCH.
Note, however, that if the sibling is a source tree, it cannot guess
which subdir the build tree is in. You will then probably end up
with headers from the sibling and libraries from the system!
Commit b6cdc06b introduced heuristics to look in the parent directory
for header files alone, while leaving the path for binary files. This
is much better than adjusting the path because one does not potentially
confuse two build directories this way.
If we give an explicit directory path it is because we want a special
version to be used instead of the system version; if there is any
problems with that, we should know up-front instead of silently start
using the system version again!
When writing the variable HAVE_SUPERLU to the config.h file, an empty
string will be interpreted as "not defined". Thus, we can use both
if and ifdef preprocessor directives to check for it. If we use zero,
then we must be careful to always use if, never ifdef.
If the user has given a path to the module, then the system paths should
not be searched, as these may contain an old and outdated version. We
don't necessarily want that just because there was a problem with our
own installation!
If the dependencies have files with relative paths that are ambigious
to our own, we want our version to be the first candidate for inclusion.
This is a variant of the reason for why we always include the build
directory first (and still does).
Deleted some unused code (or moved to opm-porsol), moved all code dealing with
time-of-flight to opm/core/tof, moved code for implicit transport solver to
opm/core/transport/implicit, spu_[im|ex]plicit.[ch] to opm/core/transport/minimal.
This change is similar to commit 89be4e14: After find_package_append_to
changed from function to macro to pick up the configuration not only
from the module itself but also from everything it pulled it, the
variable MODULE is overwritten (variable module in lower case is a
parameter, so it is replaced in the source body). Thus, the test in the
end is not whether *this* module was found, but if its last dependency
was! This made the build crash only in some projects but not in others.
