Do not set $INFOPATH

https://github.com/sorin-ionescu/prezto/commit/095863e6ae110f805725afeeb8e54977d609c797
Do not set $MANPATH

man dynamically searches for man pages based on $PATH.

https://github.com/sorin-ionescu/prezto/commit/e5de3051578ac4f48e50262265965bd45402e066
Fix lesspipe.sh detection in custom PATH

The detection of lesspipe.sh has to be done after setting PATH as it
could be installed in a non-standard bin directory. For example,
Homebrew installs lesspipe in /usr/local.

https://github.com/sorin-ionescu/prezto/commit/39795d3e5e6abf3bfacb2de29e23fcb4adc24da3
Remove the path_helper workaround

https://github.com/sorin-ionescu/prezto/commit/6fd00449a67ca1c14af1b8d5d3a582945057b2cf
Manually set locale

https://github.com/sorin-ionescu/prezto/commit/6e65349c451c7e6d8b799469179b67713d1f18e3
Adds trash util