Added tests of nnc_vector and nnc_index_list to CMakeLists.txt
Changed nnc_vector implementation to use nnc_index_list internally
Added new test for amalgameted NNC
Changed data blobs to present sorted lists of indices; that is necessary when using nnc_index_list in nnc_vector
Changed ecl_grid_init_nnc_info() to use ecl_file_select_block(NNCHEAD)
Merge remote-tracking branch 'upstream/master' into amalgamated-nnc-bug
Merge pull request #172 from joakim-hove/amalgamated-nnc-bug

Fixed bug when loading nnc info for amalagamated LGR