#1 A few neat options

[litui]

I would like to see options where you can do the following:

1) Only show characters available in the font currently
selected,
2) Only show fonts containing the character currently
selected,
3) Only show unicode subgroups available in the font
currently selected,
4) Only show fonts containing the unicode subgroup
currently selected.

These are features that though unnecessary would
provide a great deal more functionality to gucharmap.
I have been using it lately in conjunction with the
unstable release of The Gimp and would quite like to be
able to cycle fonts that support IPA extensions for
instance to see which renders the characters the way I
want and such. As it stands, I have to search through
all the fonts and even those which don't support a
certain group until I find one that changes the appearance.

Are the above features even possible? Let me know.

- Aron