Revert "+ substitute std. unicode fonts for powerline fonts"

This reverts commit 8c035901ec1268bbd702d60dbb16859fdfa19b41.

Got my powerline symbol issue resolved.  I had to recompile the
font of interest. See

    https://github.com/Lokaltog/powerline-fontpatcher
+ setup pyenv
+ setup rbenv
+ setup plenv
+ setup Renv
+ setup goenv