add AH JavaScript object to init

This object wraps the code to be executed when pages have loaded,
rather than having JavaScript mixed in with the HTML.
search within collections results on Record display page

Have JavaScript hijack search within collection requests (from ToC)
and display results (or lack thereof) in the left-hand column
with the description remaining on the right.
reinstate LZ4 compression in stores

Now that Solaris is no longer the target platform, there is no need
to avoid this optimization.

This reverts commit f4286efeecb2172b1824320a0c042ae3e1f0eead.