Use COLUMNS environment variable if present
Use COLUMNS environment variable if present

Bash sets this to the number of columns in the terminal, so in Bash,
this saves us, I believe, four spawned processes (two stty, one cut, and
one for the $() subshell) per ceylon invocation. Users of other
terminals can of course also set this explicitly.

gijsleussink/ceylon,gijsleussink/ceylon,gijsleussink/ceylon,gijsleussink/ceylon,gijsleussink/ceylon