Comment on attachment 105605 [details] [review]
Proposed patch

Instead of copying GVariantCXX from signon.cpp, move it and related helper
functions into a new src/syncevo/GVariant.[h|cpp] pair.

Feel free to remove the commented code in src/syncevo/SyncConfig.cpp.

Instead of repeating the boost::function<void (const std::string &newPassword)>
type, better add a typedef for it in IdentityProvider.h.

Last but not least, please add a src/backends/oauth2/README describing how to
use the new provider. Of particular interest to users will be how they can
extract the necessary refresh token from gSSO and GNOME Online Accounts.