[TYPO3-project-4-3] FYI: Synhing the caching framework

[Rupert Germann]

Ingo Renner wrote:
> just to let you know and so that nobody does double work... I'm going to
> update the caching framework to the version in FLOW3.

since you pointed me to the treeList cache clearing thingy I stumbled again
across the unefficient getBytag flushBytag methods (and we're still missing
a getEntriesCount() method). 
So I wanted to rewrite them to something more efficient - at least in the DB
backend where I know for shure that there a better methods for clearing
5000 entries than doing 5001 queries ;-)

but that might bring incompatibility with FLOW3.

greets
rupert