#251310: Validate exposed filter identifier such that "value" is not valid (since it cannot be made to work)

Various fixes, including making sure that exposed filter settings pass through to argument links and pager links.

A basic analyzer to help find problems, though it needs more analyzing. Plus, new theming information that will really help people figure out exactly what templates they can use to affect their output.

#240634: Due to use of field aliases that are not always valid, multiple pseudo fields weren't showing up. Fixed up the field template to better conform to other templates.

#240102: (Largely by neclimdul) -- Initial pass at profile field handlers. Still 3 @todo items remain but they are not hard.

#105125: (by moshe) Per field access control; fields will now remove themselves from views if the viewing user does not have access to see the field.

Retooled the form replacements into a single, unified form builder (which may be suitable for use in Drupal 7)