Commit 338936 by dries

Commit #338936 by Dries at 12:09
Drupal: /modules/block/block.admin.inc 1.75
Drupal: /modules/block/block.module 1.413
Drupal: /modules/block/block.test 1.46
- Patch #735900 by andypost: deleting custom block does not clean block_role() table.