Merge branch 'cleanup-ipopt-solvers' into 'master'

Cleanup ipopt solvers

See merge request !48
6 jobs for master in 6 minutes and 2 seconds (queued for 1 second)
Status Job ID Name Coverage
  Test
passed #88276
Qt551 VS2013
CoMISo-VS2013-Qt-5.5.1-x64

00:01:05

passed #88277
IPOPT3129 VS2017
CoMISo-VS2017-Qt-5.10.1-x64

00:01:10

passed #88274
Linux
clang-c++11

00:06:00

passed #88273
Linux
gcc-c++11

00:03:18

passed #88275
Apple
macos-c++11

00:04:40

 
  Deploy
passed #88278
trigger_build

00:00:01