[IMPROVED] Ignore locked account shares

* Updated getRoundShares to honor locked accounts
* Updated getSharesForAccounts and getArchiveShares

This will fix #1332 and ignore locked user accounts in share
calculations for payouts.
[ADDED] Account lock status

* Lock 1: user confirmation/unlock pending, count shares
* Lock 2: Admin disabled, ignore shares

This further addresses #1332 and should allow proper dropping of shares
for banned accounts.