Write into StructureConnection

Updated:
DataConnection
Serializer
StructureConnection
DatabaseTest
Write / read to Database
Merge branch 'master' of https://github.com/vdemotz/IntroDBProject
Unique keys insertion, get, succ and min

Work around, bugs fix
Merge branch 'master' of https://github.com/

Conflicts:
	src/ch/ethz/inf/dbproject/sqlRevisited/DataConnection.java
	src/ch/ethz/inf/dbproject/sqlRevisited/Serializer.java
	src/ch/ethz/inf/dbproject/sqlRevisited/StructureConnection.java
	src/ch/ethz/inf/dbproject/sqlRevisited/test/DatabaseTest.java