ERT-769: Added hasWell() method
ERT-769: Added __str__() for well_segment
ERT-769: Added numSegments() method
ERT-769: Added method to get segment from index.
ERT-769: WellTImeline accepts [-1] index
ERT-769: Fixed int / offset_type bug in fortio_fseek_data()

The function fortio_fseek_data() seeks to an arbitrary location in a
file; the target offset position was stored in an integer variable. For
large files this offset wrapped around.
ERT-769: Added new test for large UNRST file.
Merge pull request #640 from joakim-hove/MSW-fixup

Msw fixup
Made changes in libplot/CMakeLists.txt file so that the only necessary plplot-related variable that are necessary to set when building libblot is the PLPLOT_ROOT
Merge pull request #641 from chflo/ert_751_plplot_installation

Made changes in libplot/CMakeLists.txt file so that the only necessary p...
Changed the (duplicate) include_directories to be based on the appended CMAKE_INCLUDE_PATH, like the LIB thing
Merge pull request #642 from flikka/plplot_cmake_fix

Changed the (duplicate) include_directories to be based on the appended ...
ERT-782: Added exception class CWrapError
ERT-747: Created Python function to hook up abort() signals.
ERT-782: Added abort signals to ert_server.
ERT-782: Removed reference to missing __len__()
ERT-782: Added addSubstKeyword() function
ERT-782: Added some methods to job_queue manager
ERT-782: Added job_queue_manager to query one job
ERT-782: Made ert_socket multithreaded with mixin