Bugzilla 14672 (mdoc namespace-level summary and remarks elements weren't being included)

commit 6ec0ddc7e5c4d5640da7420600898c10578a7974
Author: Larry O'Brien <lobrien@knowing.net>
Date:   Sun Sep 15 11:03:32 2013 -1000

    Coding style

commit f034514fca8298a8ed2a167f3ab288f32bc7c74f
Author: Larry O'Brien <lobrien@knowing.net>
Date:   Sun Sep 15 10:28:47 2013 -1000

    Bugzilla 14672

    Added namespace file ("ns-{namespace}.xml") summary and remarks into the nsSummaries, which results in displaying the data prior to the namespace type-list when the user searches at the namespace level.

    Appears to only be necessary for native viewer (Web viewer for some reason "knows" about the summaries).
[mdoc] Switched from swallowing error to guarded execution

Improves a60ff0fd1e181cfde5b862cc491c682c11b9660a

Tests for file existence and outputs diagnostic rather than treating it as a local recoverable exception.

Leaving the question of general mdoc error-reporting for another day.