Required update - 0.9.4

Heatledger 0.9.4

This is a mandatory update, all nodes on the network need to run this version
or higher.

* Fixes have been applied that led to forks because of nodes not agreeing on
  what height a public key for an account was set. 
* We've also disabled cancelling of orders that have not yet been confirmed
  in a block. This functionality will come back but needs more work.
* Public keys now have their own storage file which saves quite a lot of 
  space since they dont need to be included in each account balance update 
  (which caused one entry to be written to the account data version tracker
   file). Eventually we'll be able to get the accounts and account version
  tracker files to be much smaller (their size is so large because of pre-
  occupied space to hold at a minimum 250,000 accounts and all their 
  versions over some 1400+ blocks, we expect to reduce the size of that by 
  approximately 80%).
* This release enables creating any kind of market as long as you own the 
  asset for that market.
* This release also enables the use of account email id's which you can 
  register free of charge for new accounts created through either the web
  wallet or one of the downloadable desktop versions.
* We've update the list of standard wellknown peers to almost 68 nodes now
  through the help of http://heatbrowser.com/report.html which is maintained
  by one of our community members (there is a donate address on that page!)     

Finally its advised to download the blockchain fully from the network.