1) Simplified the internal provider API a little.

2) Passed the original filename (possibly an alias) via DPB. This way it can be transmitted through the remote subsystem.

Hopefully, this should fix CORE-1105, CORE-1390 and CORE-1566 at once.
Although a better hope would be that it won't break anything else :-)

src/include/consts_pub.h

@@ -106,6 +106,7 @@
 #define isc_dpb_trusted_auth			  73
 #define isc_dpb_process_name              74
 #define isc_dpb_trusted_role			  75
+#define isc_dpb_org_filename			  76
 
 /**************************************************/
 /* clumplet tags used inside isc_dpb_address_path */