dd minor cleanup for conversions

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+++ b/ChangeLog
@@ -1,3 +1,14 @@
+2004-09-03  Paul Eggert  <eggert@cs.ucla.edu>
+
+       * src/dd.c (usage): "alternated EBCDIC" -> "alternate EBCDIC".
+       (bit_count): Remove.  All uses changed to....
+       (multiple_bits_set): New function.
+       (scanargs): Use it, and check separately for each set of
+       incompatible options, to improve diagnostics.
+       (MX): Remove.
+       (apply_translations): Move checks for incompatible options
+       to scanargs, so that they're done consistently.
+
 2004-09-02  Paul Eggert  <eggert@cs.ucla.edu>
 
        Output correct errno-related diagnostic on "paste" I/O errors.