#1989 Mixed native/managed/Python debugging does not work in VS 2012
#1989 Mixed native/managed/Python debugging does not work in VS 2012

This is a VS limitation - when mixed native/managed debugging is enabled, the old native engine is used, which precludes the new Python engine from running. The fix here is to properly communicate this by preventing selection of managed alongside Python in Attach to Process dialog for VS 2012.

enricosada/VisualStudio-SharedProject,mousetraps/xtvs-common,Microsoft/VisualStudio-SharedProject,mousetraps/xtvs-common