Attachment and Image dialogs in Wysiwyg editors should default to only allowing attachments and images to the current edited page

Currently the Image dialog has a choice of page to which attach images or take images from.

The attachment dialog used the tree design to allow to attach/link an attachment from any page in the wiki.

I believe this is an overkill and is problem and bug prone. Large wikis will take time to load the page list and/or the tree (think a wiki with 10000 spaces like Curriki).

I believe for 1.8.x we should scale back to attachment and image from the current page with a simpler and more effective dialog. This will be much more efficient for the user. When we have more time we can bring back the tree functionnality using an advanced button.

This is a usability issue as the faster the image and attachment dialogs function the better it is for the user experience. It will also allow to workaround any bugs there could be in the tree.