Changed Democracy flagtype, other changes

Reverted governments.txt so democracies use "tag.tga," as in vanilla,
and not "tag_republic.tga."

Restored some uncontroversial tag_republic flags removed prior to
previous change. (Gadsden flag is still out)

Added optional rectangular flag frames mod, as was briefly discussed in
an older thread.

Changed primary culture of Sonora to Dixie (represents William Walker's
Republic of Sonora, which is whole reason tag is in-game.)

Albania is now union tag for Albanian culture group (to match Romania as
union tag for Romanian), Czechoslovakia union tag for czech_slovak
culture group
Fixed awful Fiji flag

replaced with higher-quality version of same flag.
Merge pull request #26 from vic2mod/add-democracy-flags-and-optional-rectangular-frames-mod

Add democracy flags and optional rectangular frames mod