Introduced PayloadProxy for new database system.
Binary default ctor creates valid instances
conddb implementation for KeyList with pre-loading from db and de-serializing on demand
Added access to DB flavour
First iteration for namespace changeover (not compiling!)
New Condition Database implementation moved to cond namespace
Changed Streamer object to serialization functions
obsolete file, use it to give instructions
only in-time pileup
Merge pull request #1094 from ggovi/new-conddb

DB cleanups -- Namespace re-organization
Merge pull request #1100 from giamman/preparation-for-new-mixing-part-4

Fastsim new mixing -- Preparation for new mixing part 4