cindex: rename --associate to --join, test w/ real repos

The association data is just stored as deflated JSON in Xapian
metadata keys of shard[0] for now.  It should be reasonably
compact and fit in memory for now since we'll assume sane,
non-malicious git coderepo history, for now.

The new cindex-join.t test requires TEST_REMOTE_JOIN=1 to be
set in the environment and tests the joins against the inboxes
and coderepos of two small projects with a common history.

Internally, we'll use `ibx_off', `root_off' instead of `ibx_id'
and `root_id' since `_id' may be mistaken for columns in an SQL
database which they are not.

1 files changed, 1 insertions, 0 deletions

diff --git a/MANIFEST b/MANIFEST
index e1c3dc97..85811133 100644
--- a/MANIFEST
+++ b/MANIFEST
@@ -423,6 +423,7 @@ t/altid.t
 t/altid_v2.t
 t/cgi.t
 t/check-www-inbox.perl
+t/cindex-join.t
 t/cindex.t
 t/clone-coderepo-puh1.sh
 t/clone-coderepo-puh2.sh