Merge pull request #2 from psachin/master

change of terminal invoke(from 'gnome-terminal' to 'xterm')
Model Editor changes (removed terminal) & edited the log
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Subject: removed OSCAD.tar.gz from OSCAD_installer

Description:

1) removed OSCAD.tar.gz from OSCAD_installer/
2) instead, moved OSCAD/ to OSCAD_installer
3) changes in OSCAD_insaller/installOSCAD.sh
   - will copy OSCAD to $installDir instead of extracting
   - copy desktop icon