Setting submodule properties on command-line should use dots not slashes

Currently to set a property in a submodule on the command-line you have to say:

qbs build qt/core.qtVersionName:x64

For consistency you should be able to say:

qbs build qt.core.qtVersionName:x64

with a dot instead of a slash between the module and submodule name.

Discussed on the list here: http://lists.qt-project.org/pipermail/qbs/2012-March/000090.html