Merge remote-tracking branch 'upstream/master'
Cosmetic changes related to plotting and help.
Undo commit mistake relating to case handling.
Added missing image.
Merge pull request #379 from joakim-hove/ERT-382-size-mismatch

Ert 382 size mismatch
Fixed wandering window.
Merge pull request #383 from jepebe/cosmetic

Some changes related to help and plotting
ERT-523 - Summary page to be displayed in gert
ERT-523 - Added more observation keys (Summary keys).
Merge pull request #384 from jepebe/ERT-523

ERT-523 - Summary page to be displayed in gert
ERT-516 - gERT Plot Observation Points. This feature can be turned off or on.
Merge pull request #385 from jepebe/ERT-516

ERT-516 - gERT Plot Observation Points
ERT-518: Removed field variable current_case from enkf_main - should consult the actual FS properly.
ERT-518: Some changes to util_abort() which should reduce the risks of fatal failure '*in* the util_abort() function.
ERT-518: Large change to enkf_fs mount functionality. enkf_fs_umount() is private; when a enkf_fs_type variable goes out of scope enkf_fs_decref( fs ).
ERT-518: Updated Python layer for new enkf_fs semantics.
ERT-518: Included ert_test_context in the general libenkf library - and removed test library ert-test.
ERT-518: Added set_store() method to ert_test_context
ERT-518: Added method enkf_main_get_fs_ref() which increases refcount on fs before returning; mainly for Python use.
ERT-518: Added ert_test_context as Python class.