When finding more than a single block between runs it added shares to a
new block from a previous one. Properly fetch the last highest share ID
from the database prior to scanning for shares assigned to a block.
Fixes#124
* Findblocks cronjob changes
* Find & Store upstream share
* Use last found `share_id` as starting ID or `0`
* Find & Store upstream finder
* Use last found `share_id` as starting ID or `0`
* Use stored information when running propotional payout
* Fetch current checked blocks upstream share from block table
* Fetch previous upstream share of previous block from block table
* Calculated payouts in that range of IDs
* Updated `block.class.php` to store share_id in block and fetch highest `share_id`
* Adjusted blockupdate cronjob
* Fetch block information via `gettransaction`
* Adjusted block class
* Only getAllUnconfirmed where confirmations > -1
* Adjusted transaction class
* added setOrphan method to mark orphaned transactions
* If block is orphaned
* Mark all related transactions as Orphan_*type*
* Set confirmations of block to -1 so it is ignored and marked as orphan
* Change transaction template, added listing for orphan transactions
* Add orphan status to block listings template
