Databases: Add sections and details to READMEs; jsettlers-tables.sql generic syntax (tested postgres 9.3, mysql 5.1, sqlite 3.7.2, ora 11.2); use typical example game options; from master/7ccae2b, 4b47410, fdbc02d, a3bdeef
Databases: *.sql consistent (c) email address and mysql filename
Refactor: SOCServer +authOrRejectClientUser: common code from handleJOIN, createOrJoinGameIfUserOK; from master/dd609e3, 5ee026a