"Master" config file for default rules

[realvizu]

Besides the project level config files there should be a global and/or solution level "master" config file that contains config info that you don't want to specify in each project-level config file.
(eg. the *->System rule)

Location for a "global" config file: next to the MsBuild task dll. (?)
Location for a solution level config file: next to the sln file.

[realvizu]

NsDepCop now supports multi-level config files. The tool searches the folder tree upwards from the csproj folder to find config.nsdepcop files and combines their contents.