Fix account types and add account types support to bnporc, for the account types I could get.

Types were taken from KMyMoney, which is for personal tracking, however
some types had no use (cash not something the bank can provide,
maybe credit card but it is usually the "coming" field for us).
Sources: https://en.wikipedia.org/wiki/Bank_account (but not focused on
personal banking) and it's French translation which was more interesting.
Other websites for American and Australian banking almost always mentioned three
accounts: checking/current, savings/deposits, term/fixed deposits.

And some code refactoring.

weboob/capabilities/bank.py

@@ -43,14 +43,12 @@ class Recipient(CapBaseObject):
 
 class Account(Recipient):
     TYPE_UNKNOWN          = 0
-    TYPE_CHECKING         = 1
-    TYPE_LIABILITY        = 2
-    TYPE_ASSET            = 3
-    TYPE_INVESTMENT       = 4
-    TYPE_LOAN             = 5
-    TYPE_CASH             = 6
-    TYPE_CREDIT_CARD      = 7
-    TYPE_SAVINGS          = 8
+    TYPE_CHECKING         = 1  # Transaction, everyday transactions
+    TYPE_SAVINGS          = 2  # Savings/Deposit, can be used for everyday banking
+    TYPE_DEPOSIT          = 3  # Term or Fixed Deposit, has time/amount constraints
+    TYPE_LOAN             = 4
+    TYPE_MARKET           = 5  # Stock market or other variable investments
+    TYPE_JOINT            = 6  # Joint account
 
     def __init__(self):
         Recipient.__init__(self)