Direct converters for 64-bit base code

Direct converters for 64-bit base code are shipped as load modules in <hlq>.SCEERUN2 with a four character prefix of CEQU. Change the load module prefix for all 64-bit direct converters to CEQL. In other words, a direct converter that was named CEQUxxxx in <hlq>.SCEERUN2 will be named CEQLxxxx in <hlq>.SCEERUN2.