Newer QBS version overwrite profiles of older versions

First I installed QBS 1.1.0 and created all my profiles,
which was not very easy.

Then I build from source QBS 1.2.0 and again there were issues finding the compilers. So I switched back to 1.1.0 and wanted to compile my project,
but the "qbs.ini" was messed up, because QBS 1.2.0 added some new keywords.

This is inacceptable, please make sure that every QBS version get its own profile. Or better make sure the user can decide where to store the ini file (e.g in the qbs directory)