show notification dialog when 2nd instance of wizard is launched, and don't show it when --multi-instance parameter is present.
Merge branch 'build' of https://github.com/mconstantin/nuxeo-drive into build
move setting of Controller._instance up right after check
fix for 2460
fix for 2498
Merge branch 'build' of https://github.com/mconstantin/nuxeo-drive into build
fixed 2482
fix for 2504
fix for 2508
Merge branch 'build' of https://github.com/mconstantin/nuxeo-drive into build
fix for 2320
set offline status, regardless of current status
settings files were not getting deleted in WinXP

settings files were not getting deleted in WinXP
changes for #2368
fix for 2499
Merge branch 'build' of https://github.com/mconstantin/nuxeo-drive into build
Merge remote-tracking branch 'origin/build' into 0.2.2-Grant