Online event registration - incorrect or missing values in financial_item and financial_trxn tables, and fix notices

Enable Dummy processor and configure sample event 1 (Fall Fundraiser) to use Dummy. Use online registration to register a participant. Then added Discount Fee set and repeated the online registration.

1. Fix Notices on Thank-you page
Notice: Undefined variable: initPoint in CRM_Event_Form_Registration_Confirm->postProcess() (line 755 of /Users/dgg/svn/crm_v4.3/CRM/Event/Form/Registration/Confirm.php).
Warning: Division by zero in CRM_Event_Form_Registration_Confirm->postProcess() (line 755 of /Users/dgg/svn/crm_v4.3/CRM/Event/Form/Registration/Confirm.php).
Notice: Undefined property: CRM_Price_BAO_LineItem::$int_name in CRM_Financial_BAO_FinancialItem::add() (line 107 of /Users/dgg/svn/crm_v4.3/CRM/Financial/BAO/FinancialItem.php).

2. Financial Item inserts

• This flow should create ONE financial_item row. Currently 2 rows are inserted (see financial_item.png screenshot). id 101 in the screenshot (2nd row) should not be created per Joe Murray.
• For the registration w/ discounted fee, the financial_item.financial_account_id has a NULL value instead of expected value (4)
• There's also corresponding extraneous row in civicrm_entity_financial_trxn table linking to the extraneous financial_item row.

3. Financial Trxn inserts (both non-discount and discount registration)

• total_amount is NULL, amount has been incorrectly written to Net Amount column
• status_id is NULL, s/b id for completed
• payment_processor_id is NULL, s/b id of Dummy processor

4. Edit Participant - Event Fees table his wrong values (see edit_participant.png)

• Paid column is blank and Owing column shows $100 (when I've actually paid the full fee already)
• There is also an input field under the header "Amount of Current Payment". This should not be shown if Owing is 0 (i.e. event fee is fully paid).