Close#3433.
`evil-repeat` repeat the last action, but ignore calls to `write-file`
or `evil-write`. `spacemacs/write-file` is a wrapper around those two
function, so it should be ignored to.
This change add a `switch-to-scratch-buffer` function allowing to – you
guessed it – switch to the `*scratch*` buffer, taking care of creating
it if necessary. The function is bind to `SPC b s`, `b` as it concerns
buffers, and `s` for `scratch`.
The `spacemacs/count-words-analysis' function displays results with the
default elisp formatting of associative list. This change improves it by
changing the format to a more human-readable form, and also by ordering
results by frequencies first, and then alphabetically in case of tie.
