- renamed check_bashstyle to CheckBashStyle and moved into config module
- renamed set_bashstyle to EnableBashStyle and moved into config module
- made popup window a tab page instead
- CheckBashStyle now not only check if a startup entry exists, but also if it has the correct installation prefix (in case a previous version of BashStyle-NG had a different installation prefix and thus the .bashrc contains an outdated entry) and whether the startup entry is not commented out (regard of how many # or if there are blanks before or whatever)