Remove false positive deprecation warnings from libsvn_client. We accomplish this by creating deprecated.c, putting all deprecated function therein, and declaring SVN_DEPRECATED at the top of the file to quash any warnings within it.
I plan on following this model for the rest of our libraries, in an effort to remove extraneous warnings noise and also reduce post-1.6-branch merge conflicts.
[Note: I moved stuff based upon the current compiler warnings. There may be additional deprecated functions while don't currently cause warnings, in which case I've missed those. We can move them over as we find them.]