appfuse:full-source goal removes empty folders, such as .svn/tmp. Some (many?) svn clients fail when the tmp folder is missing.

Scenario:
- check project into svn
- run appfuse:full-source
- notice that empty subfolders under .svn/ are missing

Cause:
A folder outside the old package is only created in the work folder if it contains one or more files, so the work folder will not contain empty folders.

Fix:
Retain empty folders, see attachment for suggestion

Side effect:
If the new package name is not 'org.*', then a number of empty org packages will be created