--match and --exclude cannot be used together

[gonsie]

At least in drm (and maybe in other tools) the --match and --exclude options cannot be used at the same time.

mpifileutils/src/drm/drm.c

Lines 155 to 162 in 9d463ca

	case 'e':
	regex_exp = MFU_STRDUP(optarg);
	exclude = 1;
	break;
	case 'a':
	regex_exp = MFU_STRDUP(optarg);
	exclude = 0;
	break;

mpifileutils/src/drm/drm.c

Line 352 in 9d463ca

filtered_flist = mfu_flist_filter_regex(flist, regex_exp, exclude, name);

This should be well documented. Hopefully this issue can be used to track the other tools that are impacted by this, and the effort to correctly document this limitation in the various places.