TRC blockexplorer update, new network params.

 - cryptocoinexplorer.com recently closed, now using bitinfocharts.com
 - non-fatal warning for users running client < 0.8.0.4
 - seed3 re-added to hardcoded seedlist
 - net network parameters, hopefully suitable for a larger audience
trc new blockexplorer

 - using bitinfocharts.com
Merge pull request #206 from terracoin/trc_net_update

TRC blockexplorer update, new network params.
Use a lower share difficulty in script mode with bfgminer
remove tab inserted
Merge pull request #210 from gades/fix_new_bfgminer_version

Use a lower share difficulty in script mode with bfgminer
fixed share_data being broken
Add litecoin testnet explorer
Merge pull request #220 from whitj00/master

Add litecoin testnet explorer
increased maximum worker difficulty 1000x
Merge https://github.com/forrestv/p2pool