Add documentation for Infinispan 6.0
Update docs to reflect cache stores having moved out
Update docs to reflect more hot rod clients
better error message when preload is not configured correctly
ISPN-3510 Infinispan 6.0 should be able to parse 5.2.x config files and use 5.2.x custom cache stores
ISPN-3510 Infinispan 6.0 should be able to parse 5.2.x config files and use 5.2.x custom cache stores

* added support for parsing old JDBC files
ISPN-3510 Infinispan 6.0 should be able to parse 5.2.x config files and use 5.2.x custom cache stores

* added the deprecated files removed fromt the core
Merge pull request #2078 from maniksurtani/t_docs

Merge in documentation
ISPN-3051 Allow configuring the number of segments per node

Because the algorithm for allocating segments changed, some tests had to
change as well. E.g. we can't always find a MagicKey that will be owned
by 3 particular members, as in StateResponseOrderingTest.