also fix the returned keys

syntax is the same has http://www.php.net/manual/en/function.hash-file.php

When PHP moves a file across filesystem boundaries, it does not update the access/modification times.
Thus do it manually so that this information is not lost.

If we don't use the ".php" extension the audio won't play because
it cant find the file.

Signed-off-by: Artur Duque de Souza <asouza@kde.org>

 - return the app in privateDataGet
 - implement privateDataDelete
 - split key-value storage from ocs parsing/output so plugins can use it for storage to

fixes http://bugs.kde.org/show_bug.cgi?id=264295

handle the app paramater with private data get correctly according to the spec

still fails under sqlite (and probably postgresql) but I will look more into that later

in the (rare) case that there are unreadable files show an error since it's probably a case of incorrect premissions set by someone.

patch by Debayan Banerjee

Signed-off-by: Matthew Dawson <matthew@mjdsystems.ca>

the callBack class becomes obsolete with these but all places where it is used are updates

Signed-off-by: Matthew Dawson <matthew@mjdsystems.ca>

Signed-off-by: Matthew Dawson <matthew@mjdsystems.ca>