remove tags that were used only once.
remove tags that were used only once.

I sometimes look at the overview of tags with `jrnl --tags` and there
I found it annoying to see all the tags that appeared only once. Those
are now filtered out and I print a comment saying that they were filtered out

Also changed the order (sorted by counts) in which the tags are printed. For
a CLI application I think it is nicer to see the more important version at the end

dzeban/jrnl,cloudrave/jrnl-todos,nikvdp/jrnl,beni55/jrnl,notbalanced/jrnl,maebert/jrnl,MSylvia/jrnl,MinchinWeb/jrnl,zdravi/jrnl,flight16/jrnl,rzyns/jrnl,philipsd6/jrnl,Shir0kamii/jrnl