(Also, remove bogus test dependency for hdr include check)

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.