Offer to run debugger when test fails, with breakpoint.

Add test for non-mmap tdbs.

add EXCLUDES= with more obscure modules.
use ccanlint for "make check", finally.

Unused since " tdb: no longer need seqnum store hack as we can read after prepare."

Generally clean up temp file handling.

This means we should skip building if there are no C files in module: running tests requires building the module, but not necessarily that it has any C files.

(Imported from SAMBA commit 46c99ec2a3781d53138245182345c6c2ddd9a258:
From: Andrew Tridgell <tridge@samba.org>
Date: Tue, 15 Sep 2009 14:04:22 -0700

We previously only allowed a commit to happen after a prepare
commit. It is in fact safe to allow reads between a prepare and a
commit, and the s4 replication code can make use of that, so allow it.

More sophisticated skipping: skip dependencies when one fails as well.
Allow tests to change their total_score; only access it after running (other than to check it's non-zero).