Add category order (#2592)

* Add category order

Each category has a new 'priority' attribute. It is used to sort categories in
views. Categories with the same priority are sorted alphabetically. Categories
with no priority are displayed after those with one.

For example, if we have the following categories:
- A (priority: 2)
- B (no priority)
- C (priority: 1)
- D (priority: 2)
- E (no priority)
- F (priority: 1)

They will be displayed in the following order:
- C
- F
- A
- D
- B
- E

See #190

* Shorten help text

It took too much room and will not be so necessary once we have drag &
drop

1 files changed, 1 insertions, 1 deletions

diff --git a/app/Controllers/indexController.php b/app/Controllers/indexController.php
index 2d791ce1d..967029fd1 100755
--- a/app/Controllers/indexController.php
+++ b/app/Controllers/indexController.php
@@ -173,7 +173,7 @@ class FreshRSS_index_Controller extends Minz_ActionController {
 	private function updateContext() {
 		if (empty(FreshRSS_Context::$categories)) {
 			$catDAO = FreshRSS_Factory::createCategoryDao();
-			FreshRSS_Context::$categories = $catDAO->listCategories();
+			FreshRSS_Context::$categories = $catDAO->listSortedCategories();
 		}
 
 		// Update number of read / unread variables.