load jQuery and let ReSpec wipe it out with own version

Based on conversation with Joseph Scheuhammer:
!jQuery doesn't seem to work in FF.
<script>if (typeof (jQuery) == 'undefined') … works, but not if one
asks ReSpec to save an XHTML version.  The resulting document fails to
parse at that line.
Including jquery-1.9.0 just before including ReSpec, ReSpec loads its
version of jQuery and appears to wipe out the 1.9.0 version.  And,
after publishing, the script tag for ReSpec is no longer present, and
one gets jQuery 1.9.0 from the first script tag.
some general style tweaks

reduced line-height; increased font-size in table and on code; changed
colour on code and row headers
wrap code link text in <code>
reverse nesting: <a> inside <code>
remove colour fix for <code> in <a>

Not needed now that all <a> are nested in <code> where applicable
regex fix in table/details/summary script

add a space after the first "a" so that the regex matches "a" elements
only, and allow all other elements that begin with "a" to pass through
(Thx J. Scheuhammer)
some table style tweaks
link @href to relevant page in HTML5 spec
Use inset/outset and @aria-pressed for show/hide col buttons
change summary disclosure indicator

from plus/minus to right/down arrow
wrapping ATK roles, states, etc. in <code>
wrapped xml-roles:foo in <code>
wrapped ROLE_SYSTEM_FOO in <code>
wrapped STATE_SYSTEM_FOO in <code>
fixed some <code><code>foo</code</code>
two <code> typos
wrapped STATE_SUPPORTS_FOO in <code>
wrapped IA2_FOO_BAR in <code>
Some MSAA and IA2 cleanup
more IA2 column cleanup