Support shortened command & dir name in xterm title plugin

This allows the user to see only last level of the current path (if dirname is longer than 8 chars),
and only first word of the ongoing command line if it's longer than 8 chars.

template/bash_profile.template.bash

@@ -36,6 +36,10 @@ export SCM_CHECK=true
 # Will otherwise fall back on $USER.
 #export SHORT_USER=${USER:0:8}
 
+# Set Xterm/screen/Tmux title with shortened command and directory.
+# Uncomment this to set.
+#export SHORT_TERM_LINE=true
+
 # Set vcprompt executable path for scm advance info in prompt (demula theme)
 # https://github.com/djl/vcprompt
 #export VCPROMPT_EXECUTABLE=~/.vcprompt/bin/vcprompt