[PATCH 2 of 4] add filteropener abstraction for store openers

[Adrian Buehlmann]

On 2011-05-02 09:10, Dan Villiom Podlaski Christiansen wrote:
> On 2 May 2011, at 00:47, Adrian Buehlmann wrote:
> 
>> So, the openers of basicstore and encodedstore are now derived from  
>> that
>> new abstractopener (via filteropener), but the opener of  
>> fncachestore is
>> still the good old function object as defined on line 378 in store.py.
> 
> Thanks for catching that one; I'll send a followup to fix it shortly.

There are more hidden openers. Just found another one in changelog.py on
line 91 (delayopener).