Merge branch 'mesh_copying2' into 'master'

Fix mesh copying by implementing copy constructors and clone methods

Closes #5

See merge request !25
9 jobs from master in 3 minutes and 48 seconds
Status Job ID Name Coverage
  Test
passed #40449
VS2013
VS2013-32-bit

00:00:53

passed #40448
VS2013
VS2013-64-bit

00:00:57

passed #40447
VS2015
VS2015-32-bit

00:01:04

passed #40446
VS2015
VS2015-64-bit

00:01:09

passed #40443
Linux
clang-c++11

00:01:44

passed #40445
Linux
cppcheck

00:00:43

passed #40450
Linux
doc

00:00:21

passed #40442
Linux
gcc-c++11

00:03:46

passed #40444
Apple
macos-c++11

00:01:28