GenericsWork: Lots of changes in here, tidying stuff up, moving it around. Have made some of the signature processing generics aware (still work in progress) - also started adding new parsing code for the more complex signatures we are likely to encounter, this is tested but not currently used anywhere. See GenericSignatureParsingTest
Adding BCEL src to bcel-builder project. We change/patch BCEL more frequently than we import new versions of BCEL into AspectJ - so it makes sense to make that patching process easier than the importing process. Also the Java5 support would result in an unwieldy patch.txt file.
The ANT targets in build.xml will still enable transformation of the packaging from org.aspectj.apache to org.apache for diffing with a new BCEL version, should one ever appear.