[dev] VFS_file enhancement

[Duck]

I had timeouts problems with Ansel, by checking if a view exists. The VFS 
method to check if a file exist was reading the while directory (thousands 
files) to just check if a dire exits. The patch fix this to by adding an 
method to the VFS_file implementation using the native file_exists functions. 
With this my timeouts expired.

I also added a check if file_put_content exists, if so it uses for storing 
data.

BTW: I am unable to submit a patch on bugs.horde.org. After a submit I am 
redirected to step 1.

Duck
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