preliminary code to allow multiple servers using same database without sacrificing internal data caching
fixed problem with random salt generation
improvement on replication using modification stamps in users and groups collections
tweaks to password code
made user and group creation safer in a multiple instance setup
cache_replicate config option to set cache replication interval (0 disable)
removed some useless db code
fixed typos
ipmaskcache merged into usercache to make replication easier
message change
Merge branch 'cache_replicate' into bio-master