Add prettyprint feature to the list of available .gitignore

[EdoB]

Hi karan! I found the simple comma separated list produced by $ joe ls a bit confusing since it is growing every month! It can be helpful to provide a more formatted list to consult.

I made a simple function that takes as input the already sorted list and creates a table with capital letter headers. The table size depends on the size of the terminal.

I added the two optional attributes -p or --pretty combined with ls or list $ joe ls -p

Hope you like it!