Prevent ~/.xsession-errors from filling filesystem

As late as Ubuntu 14.04 / Linux Mint Debian Edition from NOV-2014,
errors in ~/.xsession-errors occasional fill the entire file system
where ~/.xsession-errors is located.

See
http://askubuntu.com/questions/93718/how-do-i-prevent-xsession-errors-from-eating-disk-space
for a little more information.
Indent using two spaces for Salt files
Use etags default file name for tag file