Allow `z -b` to do fuzzy matching

[ilyagr]

If z -b foo bar finds no exact match in the path to the current directory, it tries a "fuzzy" substitution with a frecent directory. For example, if we are in ~/github/jekyll/test and run z -b jek gh, it will try to substitute the entire jekyll path component with gh. The result will be equivalent to running z ~/github gh test.

The middle commit changes indentation, but is a no-op.

I've been using this for a bit. It seems nice.

[skywind3000]

Thanks, this is a big patch, I will review later.

[ilyagr]

Sure, take your time! Anyone who wants to can try this out using this branch.

I added one more feature to z -b in my fork, but I have some doubts if that one actually makes sense or is worth the complexity.

[skywind3000]

thanks

[ilyagr]

Thank you! :)