changed the default knc header file from 'knc-i1x16.h' to 'knc.h'
Merge pull request #862 from ncos/knc-backend-merge

Modification of 'knc.h'
Merge pull request #863 from ncos/knc-fails

Changed the default knc header file from 'knc-i1x16.h' to 'knc.h'
switched on the vec16_i1 struct (replaced vec16_i1 typedef)