Changes a few runes for ease of use and making useless runes mildly useful.

Teleport Other no longer requires 3 cultists standing around it to use, can not teleport user.

Communicate rune no longer deletes on first use, talismans still do.

Free Cultist no longer requires 3 cultists to use. (This rune was pretty useless, and still is. Should probably replace it.)
Update runes.dm
Removed pointless code in communicate rune.

Removed code that didn't need to be there, changed usr to user as per Giaco's recommendation.
Merge pull request #1244 from Sabbat/Cult

Changes a few runes for ease of use and making useless runes useful.