variable substitutions in NarProperties (aol.properties) does not work

[metux]

The variable substitution in aol.properties doesn't seem to work.
Doesn't actually seem to be implemented at all.

1. many sites have calls like this: NarProperties.getInstance(mojo.getMavenProject()).getProperty( ... )
2. the getInstance() method basically looks in a cache for an existing cached properties object or loads a new one
3. when loading, first tries to find out the file name and then just using a plain java.util.Properties
4. on actual loading, nothing looks at the maven project and does the variable substitution.

ergo: variables cannot be used at all in aol.properties - everything needs to be hardcoded.