Bugs in --config handling

[nico-izo]

Three issues:
1.) We are trying to load /usr/bin/profiles.json

qutim/src/lib/qutim/profile.cpp

Line 151 in f4f1918

QDir dir = qApp->applicationDirPath();

And if it exists, --config will be ignored.

2.) We trying to open ~/.config/qutim even if --config is set

qutim/src/lib/qutim/profile.cpp

Line 174 in f4f1918

dir.mkpath("qutim/profiles");

3.) And we are not handling this case in --config

qutim/src/lib/qutim/profile.cpp

Line 152 in f4f1918

if (dir.exists("profiles.json") || (dir.exists("profiles") && dir.cd("profiles")))

So if you have 0.3.3 config, attempt to open it in 0.4 with --config will fail.