Use int64 instead of *Type for Accounts/Securities

Otherwise, gorp gets confused and won't assign an int64 type from the
database to an AccountType, even though they're really the same datatype.

accounts.go

@@ -8,10 +8,8 @@ import (
 	"strings"
 )
 
-type AccountType int64
-
 const (
-	Bank       AccountType = 1
+	Bank       int64 = 1
 	Cash             = 2
 	Asset            = 3
 	Liability        = 4
@@ -25,7 +23,7 @@ type Account struct {
 	UserId          int64
 	SecurityId      int64
 	ParentAccountId int64 // -1 if this account is at the root
-	Type            AccountType
+	Type            int64
 	Name            string
 }
 

securities.go

@@ -6,10 +6,8 @@ import (
 	"net/http"
 )
 
-type SecurityType int64
-
 const (
-	Banknote   SecurityType = 1
+	Banknote   int64 = 1
 	Bond             = 2
 	Stock            = 3
 	MutualFund       = 4
@@ -21,7 +19,7 @@ type Security struct {
 	// Number of decimal digits (to the right of the decimal point) this
 	// security is precise to
 	Precision int64
-	Type      SecurityType
+	Type      int64
 }
 
 type SecurityList struct {