0005093: LastModified on folder changes on new file but not on file deletion
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Description:
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There's a folder property called lastModified (in UI and API). This lastModified timestamp
changes whenever I add a new file to that folder. But if I delete a file from that folder
the lastModified attribute of this folder remains unchanged.

IMHO a file deletion within a folder is a modification and should be reflected as well.

I did change priority from normal (standard) to high because this current behaviour has
impact for all developers using the API for example - but not only for them. You can't be
sure that something has changed in a particular folder - so you need to dive into all
folders. This has dramatic impact on traffic to your servers.

I will add the same bug report to the Wuala API group because it may be of interest there too.


Steps to reproduce:
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1. Create a folder called Test (wait a minute).
2. Create a folder Test2 within Test (wait a minute).
3. Add two files to Test2 (wait a minute).
4. Remove one file from Test2.

Results (time is an example)

1. lastModified on Test e.g. 12:00
2. lastModified on Test2 *AND* Test 12:01
3. lastModified on Test 12:01, on Test2 *AND* both files 12:02
4. lastModified not changed for any folder/file --> here Test2 should show lastModified 12:03