(partially) restore CL:LOAD from jar files.
There is apparently a fair amount of "breakage" of cases that used to load no longer working which seems due to the changes in the semantics for finding the FASL init loader. The following tests are now broken but no longer cause the JVM to crash: JAR-PATHNAME.LOAD.HTTP.1, JAR-PATHNAME.LOAD.HTTP.2, JAR-PATHNAME.LOAD.HTTP.4, JAR-PATHNAME.LOAD.HTTP.6, JAR-PATHNAME.LOAD.HTTP.7, and JAR-PATHNAME.LOAD.HTTP.9. Need to follow this up in subsequent work. Fixed the underlying HttpHead.get() interface used to determine whether to used a cache version. The custom HTTP HEAD code that was working under Java 6 no longer worked on Java 7. Added to HttpHead.get() asynchronous java.lang.Throwable on a socket timeout of 5000 ms.