add info to received page

[gulkily]

Technical explanation:

You are seeing this placeholder page because the server is still processing your submission.

The submission has been saved to the server, and you can view its text file.
However, something has stalled the process of creating the full page,
which is why you are seeing this placeholder page.

The usual cause of this is that the text file has not been indexed yet,
which can happen intentionally, if post/index_file_on_post = 0, or
if something fails in the full page generation.

If you see this page, you can run perl -T index.pl [filename] to index the file,
or perl -T index.pl --all to index all files.

If you see this page, there may be something wrong with the hashing, such as
an item's hash changing after it is indexed, or a file being renamed incorrectly.

As a workaround, you can run hike index to reindex all files, or hike index
to index one file.

a) edit text, has duplicate text

b) add possible cause that sqlite3 is unavailable

c) need better indication of missing sqlite3

d) how to recover gracefully?