1 [*] add "-=" 'assign' (to exclude elements from list)
2 [*] $(>[2:S=.tiles]) -- bugs us out (adds extra char)
3 [.] replace regexp library with new one (from Tcl?)
4 [.] glob: allow ']' and '-' escaping inside ranges
5 [.] InstallConfig target with 'cfgname.new' if old one exists
