Add -c option to merge

This adds an option "-c" (long form --change) that is shorthand for
"<rev -1>:<rev>", to merge.

The only thing i'm a little iffy on is whether we should add more state
just so we can tell the user they specified both "-r" and "-c", instead
of just saying we found multiple revision arguments (which could pop up
from multiple -c's, multiple -r's, or mixing -c and -r)

The -c option was discussed a while ago, and nobody seemed to object to
it. They only objected to allowing the same formats that svk allows,
instead of just the single revision form.

I'll wait a few days for objections or ideas or whatever before
committing.

[[[

  Add a -c option to merge to represent change number.

  * subversion/clients/cmdline/main.c
    (svn_cl__option): Add 'c'/'change' option.
    (svn_cl__commands): Merge can take 'c'.
    (main): Handle parsing for 'c'.

]]]

--Dan

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