Templates XHTML compliance fixes

Templates XHTML compliance fixes

Nearly all modified templates had a issue of:
 - no xmlns tag inside of the html tag
 - no type tag inside the stylesheet link rel's
 - no /> for some form elements

bugfield_input_text was missing a ending > for maxlength that made the output
visually break, and push everything onto one column, also making validation fail.

There are other validation warnings, such as for empty options in select fields
among others, but those are non-offensive, thus they don't exactly need attention.

Signed-off-by: Elisamuel Resto <ryuji@sourcemage.org>