Although the method is marked as thread safe in the docs, if you use a
database plugin it ends up not being thread safe.

Operator = is not thread-safe, but copy constructor looks to be. This
is causing an intermittent crash.

Need to check for QImage failure otherwise it will through a qWarning.

Found by valgrind.

Set max zoom to wrong value for BING to avoid excessive memory consumption - this is a workaround, not a fix

Proxy now follows system proxy

I looked at the latest version of opmapcontrol in OpenPilot. This has
not yet been fixed. So added pragma to silence.

I looked at the latest version of opmapcontrol in OpenPilot. This has
not yet been fixed. So added pragma to silence.

Put libraries into one libs directory under qgroundcontrol. Changed the neccessary files with references to those libraries.