Fully integrate financial_trxn, entity_financial_trxn tables

Currently, manually recorded contributions do not result in entries in the civicrm_financial_trxn and civicrm_entity_financial_trxn tables; they are only created for payments made via online contributions. This issue fixes that. Also, it updates the schema for civicrm_financial_trxn table to reflect changes for CiviAccounts.

Modify xml/schema/Financial/FinancialTrxn.xml as follows:
Rename from_account_id to from_financial_account_id by following the model of <change> <changedName> used elsewhere, eg to_financial_account_id. Search for any code that refers to this field and modify appropriately to new name.
Remove trxn_type.
Add payment_processor_id field.
Fill in the payment_processor_id based on a lookup using the payment_processor field (ie create upgrade script that translates payment_processor to payment_processor_id using civicrm_financial_trxn.payment_processor=civicrm_payment_processor.name and add it to CRM/Upgrade/Incremental/sql/4.2.alpha1.mysql.tpl)
Then remove payment_processor field.

Add an ALTER statement to rename from_account_id to from_financial_account_id.

When contributions are manually added or edited through the browser, specifically when a civicrm_contribution record is (added or (edited AND there is no civicrm_entity_financial_trxn pointing to the civicrm_contribution record))), change the code so that rows are inserted in civicrm_financial_trxn and civicrm_entity_financial_trxn tables as follows:

Add a new field to the form(s) (civicrm/contribute/add?reset=1&action=add&context=standalone or civicrm/contact/view/contribution?reset=1&action=add&context=contribution&cid=103) as follows:

• under Received and above Paid By
• label: Received Into
• select box containing all civicrm_financial_account items with financial_account_type_id of Asset
• store in civicrm_financial_trxn.to_financial_account_id
• field is required

civicrm_financial_trxn : take values from the form except:
payment_processor - null
trxn_result_code - null

civicrm_entity_financial_trxn:
entity_table='civicrm_contribution'
entity_id=civicrm_contribution.id
financial_trxn_id=civicrm_financial_trxn.id
amount=civicrm_financial_trxn.total_amount

Create tests/phpunit/WebTest/Contribute/OfflineContributionTest.php and tests/phpunit/WebTest/Contribute/StandaloneContributionTest.php..