[mac] use qsettings to store defaults, and fix related bug
add more details to on-ssl-errors messagebox
fixed coding styles
Merge pull request #194 from haiwen/enhance_ssl_error_prone_2

add more details to on-ssl-errors messagebox
Merge pull request #197 from haiwen/maintain_patch_2

[mac] use qsettings to store defaults, and fix related bug
added file browser
[filebrowser] part 2