Merge branch 'halfedge-vector-and-length' into 'master'

Halfedge vector and length

See merge request !67
9 jobs for master in 4 minutes and 58 seconds (queued for 1 second)
Status Job ID Name Coverage
  Test
passed clang-c++11 #77898
Linux

00:04:46

passed cppcheck #77900
Linux

00:03:50

passed doc #77905
Linux

00:00:26

passed gcc-c++11 #77897
Linux

00:03:59

passed macos-c++11 #77899
Apple

00:03:10

passed VS2015-32-bit #77904
VS2015

00:01:19

passed VS2015-64-bit #77903
VS2015

00:01:26

passed VS2017-32-bit #77902
VS2017

00:01:24

passed VS2017-64-bit #77901
VS2015

00:01:20