[PATCH] fix usage messages

[Bob Wilson]

The lists of demangling styles in usage messages do not include the java and 
gnat styles.  This patch adds them.  The names of all the demangling styles 
are quoted inconsistently in these messages -- some of them use both back and 
forward single quotes and some use only the forward quotes.  Judging from 
other quoted text elsewhere, the backward/forward combination seems to be the 
most standard, so the patch also changes to use that style consistently.

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