Add special characters

[fsteeg]

004D+0303 and 006D+0303 (m as in ñ)

[claesn]

Also add m with straight horizontal line above char (found in Vol. IX, page 1, line 21).

[claesn]

Another one missing: a with upside down "roof" (^) above (found in Vol. XI, page 147, line 1)