git: kill osx credential helper

Signed-off-by: Christopher Larson <kergoth@gmail.com>
git: add 'ignored' alias

Shows all existing but ignored files/directories.

Signed-off-by: Christopher Larson <kergoth@gmail.com>
scripts/brew-leaves-sizes: kill stderr on brew-leaves

Signed-off-by: Christopher Larson <kergoth@gmail.com>
shell,ksh: export HISTFILE for non-zsh shells

Signed-off-by: Christopher Larson <kergoth@gmail.com>
shell: export DOTFILESDIR pointing to this repo checkout

Signed-off-by: Christopher Larson <kergoth@gmail.com>