Set blocks to be hidden from anonymous users.

Attached are two patches that creates a new column in the /admin/block section called "hidden".
Each block can be set to be hidden from anonymous users so that only logged in users can view
the block. I use this feature extensively on several Business related websites, where I don't want
backend blocks (eg the "Navigation" block) to be visible to the general public. This helps to create
a much more smooth/slick Business related website, utilizing the Drupal as a backend CMS
platform for managing the content. This coupled with changes to the Themes to strip attributions
and other related useless "community" oriented information creates a very trimmed down
business specific capability to Drupal.

I suspect there are other uses/reasons for this code. I know that blocks can utilize the "custom"
feature to allow users to select whether or not to show blocks, but that method doesn't allow
control over anonymous users viewing of blocks. Some other examples might be displaying of
certain blocks to users after they have logged in (rich content for "paying" or "contributing" users;
eg "benefits").

Changes/notes:
+ Added new "hidden" column
+ Code changes to the modules/block.module file to enable the column
+ databases/database.mysql changed to add the new column on new installs
+ databases/database.pgsql changed to add thenew column on new installs
+ databases/updates.inc new function update_110() added to modify existing database instances
+ patch based against Drupal 4.5.0 release code
+ patches created with "diff -unR -F^f" format
+ apply from the base drupal install directory with "patch -p 0 < block.module.patch"
and "patch -p 0 < block-database.patch"
+ I verified patches update the associated files correctly, and subsequently that the feature works

v/r

Shane