Updated PasswordLogin.java and style.css for 508 compliance

In order to layout the form with properly linked labels, I rewrote the PasswordLogin transformer to avoid tables and the CSS to produce a similar layout.

FB6686
Convert Text fields that should be hidden to Hidden fields in SearchFilterTransformer

Affects home page

FB6686
Put "results/page" et al in <label>, add template to render it correctly

FB6686
Changed "Select your article status" from label to span

508 compliance issue
FB6686
Wrap radio text in label tag

FB6686
Copy original version of choice-authority-control.xsl

From dspace-xmlui/dspace-xmlui-webapp/src/main/webapp/themes/Mirage/lib/xsl/aspect/general/choice-authority-control.xsl

FB6686
Change authority-controlled input fields to hidden, for 508 compliance

FB6686
Add alt text to authority icon in DSpaceUpdateConfidence

From jim's notes:

TODO: Add this in some version of 'choice-support.js' > DSpaceUpdateConfidence()

    ! There are several 'choice-support.js' files. Which one is the real source!?

FB6686
Move long alt text from About > Reposistory features to longdesc resource

FB6686
Convert 'Contact Form' h2 into a legend around the feedback form

FB6686
Add 'opens in a new window' to powered by DSpace link

FB6686
Convert identity and security <h2> elements into <legend>

FB6686
Add external-link image to PDF links

FB6686
Move 'Add Refinement' to the left of the <select> and render it as 'label-at-left-nobr'

FB6686
Combine login and sign up into one link

Tweak CSS for combined login/sign up
FB6686
Merge branch 'dryad-master' into fb6686

Conflicts:
	dspace/modules/xmlui/src/main/webapp/i18n/messages.xml
Merge pull request #296 from datadryad/fb6686

Address issues for 508 Compliance cleanup