AAindexStreamReader for the BioJava project

Originally developed for the BioWeka project, the AAindexStreamReader class (among other classes) became part of the BioJava project, at this time only available through the CVS. The purpose of this class is to load Amino Acid Index Database files (AAindex1 files) into a set of SymbolPropertyTable objects. The AAindex database defines over 500 different property tables for the twenty amino acids. Using these property tables one can e.g. calculate the average hydrophobicity of an amino acid sequence, i.e. protein.