back-config, overlays

[Howard Chu <hyc@symas.com>]

It looks like all of the necessary back-config infrastructure is now 
working. I've converted the Syncrepl Provider and ProxyCache overlays to 
the table-driven config and the standard tests still pass, so nothing 
has broken at least. It should be pretty straightforward to convert all 
of the remaining backends and overlays using back-ldif/back-bdb and 
these two overlays as models. The ProxyCache code is particularly 
instructive as it shows how to use the hooks to add an arbitrary entry 
underneath the overlay entry (in this case, for carrying the 
configuration of the cache database). If anyone feels like getting their 
hands dirty, this would be a good opportunity to jump in and help out 
with the remaining conversions. I suggest you respond here with the 
particular backends/overlays you want to work on, so we can coordinate 
the work and OID allocation. Also it'd be good to get more eyes 
reviewing the code and asking questions about whatever is unclear. We 
can turn whatever comes up into FAQ material etc...

--
 -- Howard Chu
 Chief Architect, Symas Corp.       Director, Highland Sun
 http://www.symas.com               http://highlandsun.com/hyc
 Symas: Premier OpenSource Development and Support