uniboxify: add some special cases for ircd-ratbox "/map"

irc.teksavvy.ca[9TS] ----------------------------- | Users:   634 ( 2.2%)
 `- ircd.choopa.net[187] ------------------------- | Users:     3 ( 0.0%)
     |- ny.us.hub[6H2] --------------------------- | Users:     3 ( 0.0%)
     |   |- west.us.hub[619] --------------------- | Users:     2 ( 0.0%)
     |   |   |- irc.eversible.com[0FF] ----------- | Users:  2751 ( 9.7%)
     |   |   `- irc.mzima.net[0MG] --------------- | Users:  1091 ( 3.9%)
     |   |- irc.paraphysics.net[9LO] ------------- | Users:  1601 ( 5.7%)
     |   `- hub.efnet.us[420] -------------------- | Users:     1 ( 0.0%)
     |       |- irc.Prison.NET[0WN] -------------- | Users:  1097 ( 3.9%)
     |       |- irc.servercentral.net[1UP] ------- | Users:  2075 ( 7.3%)
     |       |   |- irc.serious.biz[3UP] --------- | Users:    61 ( 0.2%)
     |       |   `- chat.efnet.org[2UP] ---------- | Users:    72 ( 0.3%)
     |       |- irc.colosolutions.net[8ME] ------- | Users:   842 ( 3.0%)
     |       |- irc.umich.edu[088] --------------- | Users:  1142 ( 4.0%)
     |       |- ircd.arcti.ca[888] --------------- | Users:     0 ( 0.0%)
     |       |   `- irc.arcti.ca[88A] ------------ | Users:   715 ( 2.5%)
     |       |- hub.se[0SE] ---------------------- | Users:     1 ( 0.0%)
     |       |   |- irc.ac.za[98Z] --------------- | Users:   435 ( 1.5%)
     |       |   |- efnet.port80.se[91X] --------- | Users:  1655 ( 5.9%)
     |       |   |- irc.du.se[1DU] --------------- | Users:   397 ( 1.4%)
     |       |   |- irc.efnet.pl[3PL] ------------ | Users:  1455 ( 5.2%)
     |       |   |- irc.underworld.no[1UW] ------- | Users:  2159 ( 7.6%)
     |       |   |- hub.dk[0DK] ------------------ | Users:     1 ( 0.0%)
     |       |   |   |- irc.homelien.no[0NO] ----- | Users:   810 ( 2.9%)
     |       |   |   `- irc.inet.tele.dk[6DK] ---- | Users:  3077 (10.9%)
     |       |   |- hub.efnet.nl[000] ------------ | Users:     2 ( 0.0%)
     |       |   |   |- irc.swepipe.se[1DP] ------ | Users:  1019 ( 3.6%)
     |       |   |   |- irc.efnet.fr[0FR] -------- | Users:   121 ( 0.4%)
     |       |   |   `- efnet.xs4all.nl[4XS] ----- | Users:  1434 ( 5.1%)
     |       |   `- efnet.portlane.se[9PL] ------- | Users:   867 ( 3.1%)
     |       |- backup.services.int[69A] --------- | Users:     1 ( 0.0%)
     |       `- services.int[411] ---------------- | Users:    55 ( 0.2%)
     |           `- irc.shoutcast.com ------------ | Users:     0 ( 0.0%)
     |- irc.choopa.net[4SS] ---------------------- | Users:  2444 ( 8.7%)
     |   `- irc2.choopa.net[001] ----------------- | Users:   212 ( 0.8%)
     `- test.services.int[4LZ] ------------------- | Users:     2 ( 0.0%)
uniboxify: preserve leading whitespace