Julia: Use troubleshoot

Troubleshoot

• readdir(),pwd(),cd('') - to get info abut files
• using Revise - to interactively relod modules with type definities correctly

Plots.jl problem with compilation

• Problem:
  • julia> Pkg.add("Plots") made problem with compilation of Cairo, HarfBuzz, Qt6Base, libass, Pango, Qt6ShaderTools, libdecor, Qt6Declarative, FFMPEG, GLFW, GR, Plots
  • this was due to mismatch in version of libglib2.0-0 (system:2.72, julia's:Glib_jl has 2.84) having problem with exported symbol g_dir_unref
• Solutuion:
  • run like this unset LD_LIBRARY_PATH; julia
  • add this alias julia='env -u LD_LIBRARY_PATH julia' to .bashrc