Heart surgery no.2: the inventory service hooks.

Several improvements in the connectors themselves.
Several improvements in configurations.
Needed to add a hack in IUserService and UserManagerBase, to be removed when that service is refactored.

bin/config-include/FlotsamCache.ini.example

@@ -0,0 +1,39 @@
+[AssetCache]
+    ;;
+    ;; Options for FlotsamAssetCache
+    ;;
+    
+    ; cache directory can be shared by multiple instances
+    CacheDirectory = ./assetcache
+    ; Other examples:
+    ;CacheDirectory = /directory/writable/by/OpenSim/instance
+
+    ; Log level
+    ; 0 - (Error) Errors only
+    ; 1 - (Info)  Hit Rate Stats + Level 0
+    ; 2 - (Debug) Cache Activity (Reads/Writes) + Level 1
+    ;
+    LogLevel = 0
+
+    ; How often should hit rates be displayed (given in AssetRequests)
+    ; 0 to disable
+    HitRateDisplay = 100
+
+    ; Set to false for disk cache only.
+    MemoryCacheEnabled = true
+
+    ; How long {in hours} to keep assets cached in memory, .5 == 30 minutes
+    MemoryCacheTimeout = 2
+
+    ; How long {in hours} to keep assets cached on disk, .5 == 30 minutes
+    ; Specify 0 if you do not want your disk cache to expire
+    FileCacheTimeout = 0
+
+    ; How often {in hours} should the disk be checked for expired filed
+    ; Specify 0 to disable expiration checking
+    FileCleanupTimer = .166  ;roughly every 10 minutes
+    
+    ; If WAIT_ON_INPROGRESS_REQUESTS has been defined then this specifies how 
+    ; long (in miliseconds) to block a request thread while trying to complete 
+    ; an existing write to disk.
+    ; WaitOnInprogressTimeout = 3000