bashrc: use $XDG_CACHE_HOME for histfile
bashrc: add some aliases
vim: comment out cursorline stuff
bash: use ${LANG/%x/y}, make it uppercase

- 4556b8acc62fe3f81399dac0baab606d73a942a7 added ${LANG%x}y syntax

- d2bbda5925e70a5a037429b79df6dc4de61f34b0 made the UTF-8 uppercase

- 907cab0e8cdf8344e4b1696368c1b518f0f7c20f changed to ${LANG/%x/%y} and
  lost the uppercase charset – which once had a commit message "compat
  reasons", but I have no idea *what* kind of compat. Maybe NetBSD?

- 5eb2d3b8b21a2dd350072283f72050130f68cbf0 reverted to ${LANG%x}y, not
  sure if I undid it intentionally or not – it might have been because
  of the longer syntax

- now I'm adding again; this time I don't add the quotes, since I can
  just patch my custom vim.sh to avoid the awkward coloured "-8".

Those who forget history...
bashrc: theme: add comment