New EBCDIC version to test

I've now audited the remaining tests skipped under EBCDIC, and as a 
result, some I've tweaked so they should work on EBCDIC, some I'm not 
sure why they were skipped, so am enabling them to be tested to see why, 
some should be skipped on EBCDIC for various good reasons, and some are 
just too painful to port and do it maintainably.  These are generally 
UTF-8 malformations that don't port well to UTF-EBCDIC.

The new branch also enables testing of Encode.