Merge pull request #1 from Ensembles/master

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

dl lib on linux only
Added #include <stdio>
Added ecl_win64 for testing large files on win64 + split list of tests in sep file
CHanged ecl_win64 to write ~2GB file
Added ecl_file_open() test
Added new structure nnc_vector
Rewritten nnc_info to use nnc_vector
Merge remote-tracking branch 'upstream/master' into nnc-vector
Merge remote-tracking branch 'upstream/master' into nnc-vector
Merged with master
Added thin wrapper functions util_fseek(), util_ftell() and util_rewind()
Using wrapper function util_fseek(), util_ftell() and util_rewind() in librms
Using wrapper function util_fseek(), util_ftell() and util_rewind() in libert_util
Using wrapper function util_fseek(), util_ftell() and util_rewind() in libenkf
Using wrapper function util_fseek(), util_ftell() and util_rewind() in libecl
Minor updates to build on windows
Added #ifdef _WIN64 in util_win64.c
Added wrappers util_stat() and util_fstat() in util_win64
Using off_t based functions ftello() and fseeko() in util_fseek and util_ftell