updates to importwalletdat, ScanForWalletTransactions no accepts a bool fImport to bypass metadata checking on a wallet import. Otherwise a rescan may not occur
importwalletdat now returns an error when file is not found and not longer creates a new wallet file
Merge pull request #32 from l0rdicon/staging

some fixed for importwalletdat. Error returned now when wallet file is not found and ScanForWalletTransactions was modified to accept a bool for when a wallet is being imported. It skips a section that can cause rescanning not to properly occur