Uniquify starts_with textfield

Previously, multiple text fields on the page had id/name 'starts_with'.
 This is invalid HTML and makes it difficult to link labels for 508
compliance
Update parameter name in jumplist links
Convert 'Starts with' to label and link to field

Tweak CSS and refactor common template in Mirage.xsl for adding simple,
unstyled labels for an input field
Merge pull request #373 from datadryad/fb6686

Add labels to 'Starts with' search fields