There's no inst_mode script anymore

- Removed calling inst_mode during upgrade
Added changes file entry and raised version
Merge pull request #1 from kobliha/upgrade

Removed calling inst_mode (doesn't exist anymore) during upgrade
change to yast2-installation-control-SLES
added check for control.rng file to autoconf
updated changes
Merge pull request #2 from yast/change_to_yast2-installation-control-SLE

Change to yast2-installation-control-sle