• update to 0.3.1.2

While I'm here:

• drop LICENSE_FILE that isn't needed for well-known licenses
• strict python version to 2.x only (apps using pygtk do not (and will not) support python3)
• do not try to remove directories that we not installing

PR: 168181
Submitted by: Timothy Beyer <beyert at cs.ucr dot edu> (maintainer)