Update devel/python/python/ert/__init__.py

Will not set ert_lib_path if directory does not exist.
Update devel/python/python/ert/__init__.py
Fixed bug with dual porosity + lgr; seems it is not possible
Made sure that all LGRs inherit the dualp flag from the main grid
Merge branch 'master' of github.com:joakim-hove/ert
Merge branch 'master' into lgr-dualp-bug
Merge pull request #26 from joakim-hove/lgr-dualp-bug

Lgr dualp bug
Tried to select unix eol convention
Removed stale ASCII art
Tried to select unix eol convention II
Added version settings
changed: add multiarch support to the build system

linux distros support e.g. having both 32 bit and 64 bit versions of
a library on the system at the same time referred to as 'multiarch'
support.

this sets up the proper folder for lib installs on debian/redhat systems
Made build changes to align with OPM CMake config
Merged small fix from master
Change default lib path -> lib64
Added possibility to build bin/ecl_summary