Re-enabled checkpoints

Finding checkpoint data is done like this:

mbp-mikec:~ ddcmikec$ ./coinfiglid getblockhash 10
94cc299586cbbebccd1c03b85274ca22765dd034124258ec1e2d8fcfd44bf4bd
mbp-mikec:~ ddcmikec$ ./coinfiglid getblockhash 100
b62a256208ccf6432cb0bef40208a868f8c070b021cac00e281b4ca64d38a344
mbp-mikec:~ ddcmikec$ ./coinfiglid getblockhash 500
7e5b7a5442043bf584fc6c8699a9a1d46fea9f5c6c3afd5780b80e526dbbb474
mbp-mikec:~ ddcmikec$ ./coinfiglid getblockhash 1000
4bdcfeab51df13a8ff3dec8b34623e15dd96ff25be0b9e1a4968c14358a43f87
mbp-mikec:~ ddcmikec$ ./coinfiglid getblockhash 1500
454d945c449f601840dbdba75732539d3c7f8d9415dacaf84123d9bd3cd31384

mbp-mikec:~ ddcmikec$ ./coinfiglid getblock 454d945c449f601840dbdba75732539d3c7f8d9415dacaf84123d9bd3cd31384
{
    "hash" : "454d945c449f601840dbdba75732539d3c7f8d9415dacaf84123d9bd3cd31384",
    "confirmations" : 1,
    "size" : 188,
    "height" : 1500,
    "version" : 2,
    "merkleroot" : "79119ab0e323ecaa1237aa9b3b13ce6b5068f63940e354072e339683db4b93aa",
    "tx" : [
        "79119ab0e323ecaa1237aa9b3b13ce6b5068f63940e354072e339683db4b93aa"
    ],
    "time" : 1396380398,
    "nonce" : 30819,
    "bits" : "1e0ffff0",
    "difficulty" : 0.00024414,
    "previousblockhash" : "89ed28db1dc9656d7d554b9a1789793c692f77b025e2afb8f12b773e95ec9497"
}
mbp-mikec:~ ddcmikec$ ./coinfiglid getbestblockhash
454d945c449f601840dbdba75732539d3c7f8d9415dacaf84123d9bd3cd31384

Then search debug.log for the best block hash and take the tx= value.