title: What are sbtconfig.txt and sbtopts used for?
body: <p>In the 0.13 release of sbt, I saw these two files in sbt/conf directory, it would be really nice if I can change option inside these files instead of the launcher script.</p>
  
  <p>I changed some options in sbtopts, it doesn't take effect at all, and the sbtconfig.txt does work for some options but for this option, <code>-Dinput.encoding=iso-8859-1</code> (I need this option to use up arrow key to view history, otherwise it shows me messy codes) it only take effect when I add it in the sbt.bat.</p>
  
  <p>Another question is, can I put these two files somewhere in <code>~/.sbt/</code> ? I want to store all my sbt configurations in one place.</p>
  
  <p>My OS is Windows 8.1 and working with the SBT 0.13.</p>