Squashed 'moose-gui/' changes from 2a1f94f..6104940

6104940 units added to k1,k2,k3
a3a80bf Using force-yes with -y to avoid problem with gpg keys. Probably breaking due to policy change in apt install.
c994d93 one more attempt -y is removed
b869143 one more attempt expired key
a172670 checking with travis expired key
8ee7c22 checking with travis expired key
a208321 travis has a problem installing moose with -y opition trying this
ff92eb5 print stm with python3 and changes made WRT to pool and bufpool with isBuffered flag
744f262 isbuffered is editable and if value is set/unset
a46cec9 cleanup in demo, filemenu links

git-subtree-dir: moose-gui
git-subtree-split: 61049405f17b22f27c74e7834dc1b2cfbab61699