Remove references to old JVMs (pre-Java 6) from the user guides

DERBY-6213 removed support for Java 5 and CDC. We need to scour references to these platforms from our user documentation. This includes scouring references to JDBC 3.0 and JSR 169. Changes include the following:

-------- Admin Guide -------------

o "Differences in JDBC 3.0 methods": The section should be renamed to "Differences in JDBC methods" and references to JDBC 3.0 should be removed from its text.

-------- Developer's Guide -------------

o "Derby and Java Virtual Machines (JVMs)": the lowest supported JVM level should be changed from 5 to 6.

-------- Getting Started Guide -------------

o "System requirements": the lowest supported JVM level should be changed from 5 to 6.

o"Verifying the Derby system configuration": bullet 1, references to Java version 5 should be changed to 6.

o "Self-study tutorial for users new to Derby": references to JDK version 5 should be changed to 6.

-------- Reference Guide -------------

o "JDBC reference": Change "JDBC 3.0 and 4.0 APIs" -> "JDBC API"

o "java.sql.Driver interface": This section gives instructions on how to load the JDBC driver if you are running on an old (pre-Java 6) JVM. The section is almost vacuous now. It can be collapsed to the following summary:

"The class that loads Derby's local JDBC driver is the class org.apache.derby.jdbc.EmbeddedDriver. The class that loads Derby's network client driver is the class org.apache.derby.jdbc.ClientDriver."

o "JDBC Package for Connected Device Configuration/Foundation Profile (JSR 169)": Remove this section.

o "Features supported on all JDBC 4 releases": This section should be removed and its material should be merged into the preceding sections.

o "DataSource classes": The following changes should be made.

"Embedded environment, for applications running on JDK 5 or higher and using JDBC 3 and JDBC 4.0 methods:" -> "Embedded environment, for applications running on Java 6 or higher:"

Remove the following paragraph and the list of *40 DataSources which it introduces:

"Embedded environment, for applications running on JDK 6 or higher and using methods specific to JDBC 4.1 or JDBC 4.2:"

"Client-server environment, for applications running on JDK 5 or higher and using JDBC 3 and JDBC 4.0 methods:" -> "Client-server environment, for applications running on Java 6 or higher:"

Remove the following paragraph and the list of *40 DataSources which it introduces:

"Client-server environment, for applications running on JDK 6 or higher and using methods specific to JDBC 4.1 or JDBC 4.2:"

-------- Tools Guide -------------

o "Environment setup and the Derby tools": The minimum Java level is 6, not 5.