Clean-up 'getsize' remnants since it has been removed.

A quick grep of the code shows that the getsize option isn't getting used anywhere in core. The patch in #1 takes care of two of these mentions, but it should be more thoroughly cleaned up.

[bfroehle@fortuna drupal (master)]$ find . -type f -print0 | xargs -0 egrep getsize
./modules/image/image.module:        'getsize' => TRUE,
./modules/image/image.module: *   - getsize: If set to TRUE, the image's dimension are fetched and added as
./modules/image/image.module:  // theme_image() can only honor the $getsize parameter with local file paths.
./modules/image/image.test:    $image_info['getsize'] = FALSE;
./modules/system/system.admin.inc:          'getsize' => FALSE,

Many thanks, I'll mark it RTBC after the bot responds. (No rush, since it's likely too late for 7.0).

As mentioned by redndahead, #908282: Remove unnecessary I/O from theme_image() removed the 'getsize' functionality and most 'getsize' mentions in the code. This patch removes 'getsize' documentation that was missed in that issue, as well as some stray 'getsize' references. Since that original issue is being used for another purpose at the moment, I'm marking this issue as RTBC. I've left a note in the other issue so they are aware of this change.

Committed to CVS HEAD. If we decide to rollback #908282: Remove unnecessary I/O from theme_image() we can roll back it in one go. I'm not sure a rollback is the right approach so ...