Continued MySQL/PostgreSQL store provider refactoring

Refactored, renamed, removed storage related code.

Basic smoke test passed for PostgreSQL whilst fully working on MySQL variants as per usual.

domain/space/endpoint.go

@@ -32,6 +32,7 @@ import (
 	"github.com/documize/community/domain"
 	"github.com/documize/community/domain/mail"
 	"github.com/documize/community/domain/organization"
+	"github.com/documize/community/domain/store"
 	"github.com/documize/community/model/account"
 	"github.com/documize/community/model/activity"
 	"github.com/documize/community/model/audit"
@@ -47,7 +48,7 @@ import (
 // Handler contains the runtime information such as logging and database.
 type Handler struct {
 	Runtime *env.Runtime
-	Store   *domain.Store
+	Store   *store.Store
 }
 
 // Add creates a new space.

domain/space/space.go

@@ -19,6 +19,7 @@ import (
 	"github.com/documize/community/core/uniqueid"
 	"github.com/documize/community/domain"
 	"github.com/documize/community/domain/mail"
+	"github.com/documize/community/domain/store"
 	"github.com/documize/community/model/account"
 	"github.com/documize/community/model/permission"
 	"github.com/documize/community/model/space"
@@ -29,7 +30,7 @@ import (
 // We create the user account with default values and then take them
 // through a welcome process designed to capture profile data.
 // We add them to the organization and grant them view-only space access.
-func inviteNewUserToSharedSpace(ctx domain.RequestContext, rt *env.Runtime, s *domain.Store, email string, invitedBy user.User,
+func inviteNewUserToSharedSpace(ctx domain.RequestContext, rt *env.Runtime, s *store.Store, email string, invitedBy user.User,
 	baseURL string, sp space.Space, invitationMessage string) (err error) {
 
 	var u = user.User{}

domain/space/store.go

@@ -25,7 +25,7 @@ import (
 // Store provides data access to space information.
 type Store struct {
 	store.Context
-	domain.SpaceStorer
+	store.SpaceStorer
 }
 
 // Add adds new folder into the store.