Created two properties, one workspace scoped, the other installation time scoped.
Propagated the permanent directory to the installation properties.

The installation properties should  write to a file that should be visible to all workspaces.

Such a permanent config file wil be placed in the bundle storage (where the survey file resides as well)
The uninstaller uses the permanent, installation properties.
Properties now fall directly to file when writing and reading properties.
Merge pull request #49 from cdmihai/persistentFiles

Workspace and installation properties