Compatibility break for older logs

[luis109]

Commit: 1f1cba7

Breaks compatibility with older logs. MRA can't index, stays stuck forever...
Works fine on the previous commit: a7860f8

[paulosousadias]

This is related to this: https://stackoverflow.com/questions/61267495/exception-in-thread-main-java-lang-nosuchmethoderror-java-nio-bytebuffer-flip

See commit f63d17a with a temporary fix.

[paulosousadias]

java.lang.NoSuchMethodError: java.nio.MappedByteBuffer.position(I)Ljava/nio/MappedByteBuffer;
at pt.lsts.imc.lsf.BigByteBuffer.position(BigByteBuffer.java:78)
at pt.lsts.imc.lsf.LsfIndex.createIndex(LsfIndex.java:493)
at pt.lsts.imc.lsf.LsfIndex.checkIndex(LsfIndex.java:603)
at pt.lsts.imc.lsf.LsfIndex.loadIndex(LsfIndex.java:255)
at pt.lsts.imc.lsf.LsfIndex.load(LsfIndex.java:199)
at pt.lsts.imc.lsf.LsfIndex.(LsfIndex.java:207)
at pt.lsts.neptus.util.llf.LsfLogSource.loadLog(LsfLogSource.java:147)
at pt.lsts.neptus.util.llf.LsfLogSource.(LsfLogSource.java:77)
at pt.lsts.neptus.mra.MRAFilesHandler.openLSF(MRAFilesHandler.java:236)
at pt.lsts.neptus.mra.MRAFilesHandler.openLog(MRAFilesHandler.java:128)
at pt.lsts.neptus.mra.MRAMenuBar$1$1.run(MRAMenuBar.java:232)