svn diff fix for bug 2044

Hi,

I've made some changes to meet some feature requests regarding svn diff.

Could you please take a look and let me know if I'm on the right track?

thanks,

Gabriela

[[[

Change "svn diff" to allow removal of "-u" and use of arbitrary strings
in place of current hard-coded "-L" switch. This partially resolves.
http://subversion.tigris.org/issues/show_bug.cgi?id=2044

* subversion/svn/cl.h
   (svn_cl__opt_state_t) Add two new fields.

* subversion/svn/svn.c
   (svn_cl__longopt_t) Add new field.
   (svn_cl__options) Add new field and help information.
   (svn_cl__cmd_table) Add two new parameters.
   (sub_main) Initialize new field.
   (sub_main) Add new case.
   (sub_main) Add conditional call to svn_config_set.

* subversion/svn/diff-cmd.c
   (svn_cl__diff) Add braces and minor indentation issue?
   (svn_cl__diff) Change call to svn_client_diff6 to svn_client_diff7.

* subversion/include/svn_config.h
   () Add new declarations.

* subversion/include/svn_io.h
   (svn_io_run_diff2_2) Add new function.

* subversion/include/svn_client.h
   (svn_client_blame) Add new function. svn_client_diff7.

* subversion/libsvn_client/diff.c
   (diff_cmd_baton) Add new field.
   (diff_content_changed) Replace call to svn_io_run_diff2 with
     svn_io_run_diff2_2.
   (svn_client_diff7) Add new function.

* subversion/libsvn_subr/io.c
   (svn_io_run_diff2_2) Add new function.

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