Add booktabs package to latex base.tplx
Don't auto-move .config/ipython if symbolic link
remove an inappropriate `!`

the logic was backwards.
fix engine startup files

engine startup_file and startup_command are ignored in 2.0
Merge pull request #5716 from jakobgager/latex_booktabs

Add booktabs package to latex base.tplx
Merge pull request #5806 from bfredl/fixlink

Don't auto-move .config/ipython if symbolic link
Merge pull request #5805 from minrk/engine_startup

fix engine startup files
Merge pull request #5804 from minrk/invert-callback-clear

remove an inappropriate `!`