Fix compilation errors reported in Eclipse Mars

[Godin]

Prior to this change Eclipse 4.5.2 Mars (Build id: 20160218-0600) shows compilation errors in com.mountainminds.eclemma.core, com.mountainminds.eclemma.core.test and com.mountainminds.eclemma.debug.ui.compatibility.

Also

mvn clean verify \
    -Dimplicit-target \
    -Dplatform-repository-url=http:https://download.eclipse.org/releases/mars/

will stop at com.mountainminds.eclemma.core with inability to compile.

After this change the only remaining compilation error is in com.mountainminds.eclemma.debug.ui.compatibility and same Maven command will pass tests.

Result of opening of project in Eclipse 3.8 Juno is the same as before - only com.mountainminds.eclemma.debug.ui.compatibility contains compilation error - "cycle in the type hierarchy" what was done on purpose for compatibility with Eclipse < 3.8.

[Godin]

@marchof could you please review?

[marchof]

@Godin SupressWarning "unchecked" warning is not required at any of the places. It gives me a compiler warning with the 3.5 target. If I remove everything looks good.

Beside that:

• Compiles in Eclipse with 3.5 target
• Local Maven o.k.

[Godin]

@marchof for Mars it is exactly opposite - warning if no suppression 😆 but I removed "unchecked", will merge.

[marchof]

@Godin From my point the minimum supported version should be our default dev target. So code should compile for this version without warnings.

[Godin]

@marchof no pb.

A kind of off-topic - do you know how many users of EclEmma are on Eclipse 3.5 ? I guess this set is close to set of Java 5 users.

[marchof]

@Godin Well, AFAIK there are plenty of users out there forced o work with historic RAD versions... We can rise the bar when we're at Eclipse.org.