Fixed the initial population of the epoc32 tree with rnd bins to deal with the fact that the zips are in a slightly different location. (cf the changes made for Bug 350) Simplified the way in which the setting of sf.spec.package.src.enable is handled - no need to use it to change the zipping template, just use it to control which parts of the template we invoke.

29394d95b3e1a63e73a3f3e31f9bab42cc1437f5 fbf_configs_0.0.a
36d82a2f1f927cbe91926e19c69fe74d9170b7de PDK_2.0.c
633b96a83005daab9464a00b8fcbcfa96a247c26 PDK_2.0.d
cc2965329dd1c545c3cad90c83f2c8cf2bc7e2d6 PDK_2.0.e