Merge pull request #1 from Ensembles/master

Updates from main
Merge pull request #2 from Ensembles/master

dl lib on linux only
Added state_map implementation
Added enum realisation_state_enum
Added state_map_size() function
Added methods to state_map + locking
state_map completed with state_map_equal() and state_map_fwrite()
Added state_map_fread() to read into an existing instance
state_map_fread() will reset the map if file not found
Added function site_map_update_undefined() which will only update undefined values
Added state_map_select_matching() function
Changed meas_data to only allocate for the number of active ensemble members
Updated test enkf_state_map()
Removed unused stream variable
Re-introduced warning-as-error exception (commented). I use the Werror locally
ADded state_map_deselect() + state_map_select_matching() will only modify explicitly matching elements
Changed util_abort to dump output to a /tmp file
Changed format for file to use a user-friendly format
Merge branch 'master' into enkf-handle-killed-realisations
Added new functions to the state_map