Support configuration of target JDK level

[markiewb]

org.eclipse.jdt.core.compiler.codegen.targetPlatform=1.7
org.eclipse.jdt.core.compiler.compliance=1.7
org.eclipse.jdt.core.compiler.source=1.7

• currently it is hardcoded to 1.6

[krasa]

From my experience, it is best to just hardcode 1.7 and ignore the config file, since too many people are not able to get it right.
1.6 is tricky because it cannot format file which contains diamond operator, but returns result like everything went ok.

[markiewb]

@krasa : Thank you for the advance. I will hard-code it. If a user wants a different level he has to configure it in its configuration file.

[krasa]

I actually override what the user wants, since he does not even know that he has 1.5 in his config and then complain that it does not work.

[krasa]

Update: For formatting of 1.4 code ( package can be named 'enum') is needed 1.4 level, so I started to use a project configuration, which people normally use in the IDE...

[markiewb]

fixed in 1.10.2