Libraries of SLF4J are included in lib directory

The library of the Simple Logging Facade for Java (SLF4J) are included into the BEAM lib directory. They are a dependency of the netCDF library and included in the lib-netcdf module.

The duplication of the library leads to unnecessary warnings:

SLF4J: Class path contains multiple SLF4J bindings.
SLF4J: Found binding in [jar:file:/people/luis/beam-4.8/lib/slf4j-jdk14-1.5.8.jar!/org/slf4j/impl/StaticLoggerBinder.class]
SLF4J: Found binding in [jar:file:/people/luis/beam-4.8/modules/lib-netcdf-4.0/lib/slf4j-jdk14-1.5.8.jar!/org/slf4j/impl/StaticLoggerBinder.class]
SLF4J: See http://www.slf4j.org/codes.html#multiple_bindings for an explanation.