* switched to one universal PendingCache list.
* added mHistoricalCaches variable to p3distrib - to indicate when old caches have been loaded.
* added calls to p3GroupDistrib::HistoricalCachesDone() in rsinit.cc
* added "historical" parameter to lots of p3distrib functions.
* updated child classes to only add FeedItems if (historical == false).
* Switched Validate / Duplicate Msg checks to speed up historical data load.
* corrected rsrandom function for OSX.
* bugfix to rsloginhandler function. (compile error).
git-svn-id: http://svn.code.sf.net/p/retroshare/code/trunk@4008 b45a01b8-16f6-495d-af2f-9b41ad6348cc