mass(?) edit satsuki_ayame -> miura_ayame

According to pixiv, artist has changed her name. There is also name conflict in post #1135203 (the blonde one is Satsuki Ayame, isn't tagged yet).

I think this makes a good idea to mass edit (all six posts) satsuki_ayame -> miura_ayame and then change satsuki_ayame tag type to character one (and consequently add it to post #1135203).

EDIT: while writing this I was ninja'd by Yamaro, still my suggestion remains actual - I don't like using _(name of the series) tags when there is another solution possible.