Fixes a number of issues with the new Account system, some international character issues, a few Thingy bugs, and other issues.

Gotchas:

   * The deprecated use of Graphics::Magick has been eliminated. WebGUI uses
     Image::Magick exclusively for all image processing functions once again.

   * The Head Block of Templates has been merged into the Extra Head
     Tags field.  Extra Head Tags are now added for all templates and
     assets included on a page, except for Style templates, which do
     not have Extra Head Tags.  Existing Extra Head Tags for Style
     templates have been removed.

   * Web Services Client is no longer part of the official distribution of
     WebGUI, but is still available to be maintained by third-parties. However,
     if you don't want to use Web Services Client any longer, make sure you
     delete all Web Services Clients from your site prior to the upgrade *and*
     purge them from your trash. Then the upgrade will automatically uninstall
     the Web Services Client from your site.

Changelog:

 - security: A problem was discovered and fixed in which users could email executable attachments to a collaboration system and then when viewed online, could execute them. 
 - fixed #8800: Errors in POD of Asset-related mix-in modules (Bernd Kalbfuß-Zimmermann)
 - fixed: Products imported into the Shelf have bad URLs
 - Deprecated WebGUI::Storage::Image. WebGUI::Storage can now do everything WebGUI::Storage::Image can do.
 - The deprecated use of Graphics::Magick has been eliminated. WebGUI uses Image::Magick exclusively for all image processing functions once again.
 - fixed: #9147: Misspellings in Account
 - fixed: a bug in Crud where keys being updated would cause a crash
 - fixed: #9148: Account: account links do not work
 - fixed: #9149: Account: default templates do not work right
 - fixed: Adding a file extension for URLs in the system settings now properly affects newly created Assets.  It still does not update existing asset URL's.
 - fixed #9152: Pagination broken in Contribs Section of new Account System
 - fixed #4159: more menu doesn't appear for current asset on crumb trail
 - fixed #9157: another typ-o in i18n
 - fixed #9112: Thingy View Thing screen doesn't preserve newlines
 - fixed #9155: purpose of "headblock" duplicates "extra head tags"
 - fixed: Improve Thingy navigation.
 - fixed #9126: UserList is completely broken in 7.6.4 (Yung Han Khoe)
 - fixed #9177: Wide-characters break product varients
 - fixed #9191: Message Board reveals user email, ignores profile privacy setting (#9180)
 - fixed #4209: i18n in Rich edit in Dutch breaks
 - fixed #9196: Shelf lacks pagination
 - fixed #4208: EMS badges with Admin security visible to all
 - fixed Calendar copy behavior.  In the Asset toolbar, Copy Just this Asset
   was broken.  This has been fixed.  As a side effect, in the Asset Manager
   the default behavior is to copy ONLY the Calendar, and none of the events.
 - fixed: filtering of rich text areas very slow for large content
 - fixed: international characters are corrupted on export
 - removed: WSClient