improve the precedure of uploading directory
improve the precedure of uploading directory

- don't confirm for overwriting when uploading directory

- always force a refresh even if the uploading directory task is cancelled

- show the directory's name correctly on OS X

- fileDialog open home directory as default

daodaoliang/seafile-client,losingle/seafile-client,haiwen/seafile-client,daodaoliang/seafile-client,cloudcopy/client,haiwen/seafile-client,daodaoliang/seafile-client,lucius-feng/seafile-client,lucius-feng/seafile-client,haiwen/seafile-client,cloudcopy/client,losingle/seafile-client,cloudcopy/client,wgaalves/seafile-client,wgaalves/seafile-client,daodaoliang/seafile-client,lucius-feng/seafile-client,wgaalves/seafile-client,wgaalves/seafile-client,losingle/seafile-client,losingle/seafile-client,lucius-feng/seafile-client,cloudcopy/client,haiwen/seafile-client