Misc #205: Add 2 long options & Update documentation

- Add two long variants of short options.

- Update documentation.

compton.c

@@ -5543,6 +5543,7 @@ get_cfg(session_t *ps, int argc, char *const *argv, bool first_pass) {
     { "shadow-offset-y", required_argument, NULL, 't' },
     { "fade-in-step", required_argument, NULL, 'I' },
     { "fade-out-step", required_argument, NULL, 'O' },
+    { "fade-delta", required_argument, NULL, 'D' },
     { "menu-opacity", required_argument, NULL, 'm' },
     { "shadow", no_argument, NULL, 'c' },
     { "no-dock-shadow", no_argument, NULL, 'C' },
@@ -5550,6 +5551,7 @@ get_cfg(session_t *ps, int argc, char *const *argv, bool first_pass) {
     { "fading", no_argument, NULL, 'f' },
     { "inactive-opacity", required_argument, NULL, 'i' },
     { "frame-opacity", required_argument, NULL, 'e' },
+    { "daemon", no_argument, NULL, 'b' },
     { "no-dnd-shadow", no_argument, NULL, 'G' },
     { "shadow-red", required_argument, NULL, 257 },
     { "shadow-green", required_argument, NULL, 258 },