Minor changes to INSTALL documentation (fix smart quotes, etc.)

Fixed a bug in argument_preprocessor.py when it encounters a file that cannot be encoded into ASCII.

Replaced deprecated apt_inst method in deb_triggers.

Added the --enable-kvm switch to vm_launcher
Fixed a minor error in the INSTALL file.
Forgot to import the codecs module when fixing the unicode bug.
Merge pull request #3 from tojo2000/master

Bug fixes for deprecated functions and installation fixes.