Fix to be compliant with cmake
Update ecl_grid_reset_actnum.c

Removed array size specifier. Not necessary with predefined array.
Merge pull request #569 from iLoop2/ERT-OSX_cmake

Fix to be compliant with cmake
Updated test to reflect a name change of an executable
Merge pull request #570 from flikka/fix-job_workflow-test

Updated test to reflect a name change of an executable
ERT-700: Minor change in comment
ERT-700: Added layer class to keep track of blocks
ERT-700: Added loop edge 'walker'
Added layer_trace_block_content() for internal walking.
Implemented fault_block internally in fault_block_layer
ERT-700: Added container struct_vector
ERT-700: Rename ecl_grid_get_corner -> ecl_grid_get_cell_corner
ERT-700: Added UTIL_SAFE_CAST_HEADER()
ERT-700: Added function to get corner coordinates.

The function ecl_grid_get_corner_xyz() takes i,j,k input in the range
[0,nx] x [0,ny] x [0,nz] - and then determines the corner number
correctly.
ERT-700: Using struct_vector for edge walker
ERT-700: Work in progress
ERT-700: Fixed bug qwith lower limit in trace content
ERT-700: Added layer functionality to fault_block
ERT-700: Added Python class Layer
ERT-700: Removed unused class fault_block_collection