comma separate large numbers of EAC

hi,

got confused with large earthcoin numbers ;-)
this PR displays EAC values with comma separation every three digits.

please review carefully as i don't know what else might be affected...

turns:

![screenshot 2014-01-26 01 27 50](https://f.cloud.github.com/assets/36162/2002997/67d30440-8624-11e3-8b90-d29fcad3900b.png)

into:
![screenshot 2014-01-26 01 29 33](https://f.cloud.github.com/assets/36162/2002998/71361108-8624-11e3-80cc-bd7507f21689.png)
![screenshot 2014-01-26 01 45 29](https://f.cloud.github.com/assets/36162/2003000/768c97ee-8624-11e3-8446-4849a2433547.png)