DKRZ projects

• Improved computation of intersections for large index lists.
• Exposes more of the API to Fortran.
• Some performance/memory improvements.

• The Fortran interface and Fortran language tests have been greatly improved.
• Two calls added to determine if the library has been initialized (xt_initialize*d*/xt_finalize*d*).
• XT_INT_MIN and XT_INT_MAX limits added.
• Lots of bug fixes and code cleanup.

A new release has been made available.

Following are the most important changes:

• Every Xt_idxlist object now is given a unique ID to be used e.g. as an O(1) heuristic for equality checks.
• The source now builds with
  

  BUILD_CFLAGS='-Wall -Wextra -Wconversion -Wstrict-overflow -Wno-error=unused-function -Wno-unknown-pragmas -Werror'
  BUILD_FCFLAGS='-Wall -Wextra -Wconversion -Wstrict-overflow -Wno-error=unused-function'