Merge branch 'kb/diff-C-M-synonym'

* kb/diff-C-M-synonym:
  diff: use "find" instead of "detect" as prefix for long forms of -M and -C
  diff: add --detect-copies-harder as a synonym for --find-copies-harder

diff --cc diff.c
index 6991ed4e17343a3104d3fd518b5d85d0913e9259,b5ef1ec55e2d6a97ab00d5692a93affb66803a31..0a438694351e555f66cbb3d24759d3a10a46ff20
--- 1/diff.c
--- 2/diff.c
+++ b/diff.c
@@@ -3152,16 -3148,16 +3152,16 @@@ int diff_opt_parse(struct diff_options 
        else if (!prefixcmp(arg, "-B") || !prefixcmp(arg, "--break-rewrites=") ||
                 !strcmp(arg, "--break-rewrites")) {
                if ((options->break_opt = diff_scoreopt_parse(arg)) == -1)
 -                      return -1;
 +                      return error("invalid argument to -B: %s", arg+2);
        }
-       else if (!prefixcmp(arg, "-M") || !prefixcmp(arg, "--detect-renames=") ||
-                !strcmp(arg, "--detect-renames")) {
+       else if (!prefixcmp(arg, "-M") || !prefixcmp(arg, "--find-renames=") ||
+                !strcmp(arg, "--find-renames")) {
                if ((options->rename_score = diff_scoreopt_parse(arg)) == -1)
 -                      return -1;
 +                      return error("invalid argument to -M: %s", arg+2);
                options->detect_rename = DIFF_DETECT_RENAME;
        }
-       else if (!prefixcmp(arg, "-C") || !prefixcmp(arg, "--detect-copies=") ||
-                !strcmp(arg, "--detect-copies")) {
+       else if (!prefixcmp(arg, "-C") || !prefixcmp(arg, "--find-copies=") ||
+                !strcmp(arg, "--find-copies")) {
                if (options->detect_rename == DIFF_DETECT_COPY)
                        DIFF_OPT_SET(options, FIND_COPIES_HARDER);
                if ((options->rename_score = diff_scoreopt_parse(arg)) == -1)