Merge branch 'feature/more_fieldmatvec_operations' into 'develop'

Added some missing FieldVector and FieldMatrix operations

See merge request !62
4 jobs for develop in 20 minutes and 49 seconds (queued for 2 seconds)
Status Name Job ID Coverage
  Test
passed debian:10 clang-6-libcpp-17 #7249

00:20:49

passed debian:10 gcc-8-17 #7248

00:16:25

passed debian:9 gcc-6-14 #7250

00:13:29

passed ubuntu:18.04 clang-6-17 #7251

00:19:18