add cvar sbar_miniscoreboard_size to control the size of the mini DM overlay in items...

add cvar sbar_miniscoreboard_size to control the size of the mini DM overlay in items (or -1 makes it get a default size depending on the current HUD); shift around the frags counter a bit to work well with 4 teams in sbar_hudselector 1 and 3 teams in sbar_hudselector 0 in Nexuiz (yes, then 4 teams display is knowingly broken, but it looks like we can use sbar_hudselector 1 in the next release)

git-svn-id: svn://svn.icculus.org/twilight/trunk/darkplaces@7458 d7cf8633-e32d-0410-b094-e92efae38249