JRE versus JDK in OSX

[pslack]

JRE on OSX does not work with the new MXJ , users must install the larger JDK for OSX for MXJ to work properly at run time.

[kristofb]

For that, we need to change getJavaJli to search in
"%s/lib/jli/libjli.dylib"

But, I think now we needs to check if JDK jli exists, if not check if JRE jli exists, in that order.
Then return the appropriate file path from getJavaJli

And we probably also need to modify getHome:
1- call "/usr/libexec/java_home" call to check JDK,
2- in case of failure, check presence of "/Library/Internet\ Plug-Ins/JavaAppletPlugin.plugin/Contents/Home/bin/java" to check JRE

I'll test it.