OpenACS

This change improves scalability especially on sites with high numbers

of concurrent requests by reducing the number of required locks in

general. This change keeps the parameter dict in a per-request cache

to reduce potentially high number of nsv locks, when parameters of a

package are queried a often per request. Without this change we see on

some sites > 100 locks on the ad_param-nsv per request. Alone the

request-procesor queries a larger set of parameters from the acs-core

package, which requires now a single lock operation.

Using the per-request cache has the advantave of avoiding locks and

keeping the internal representations of tcl-objs (whereas ns_cache or

nsvs use plain strings).

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