util._matcher: unify pattern normalization This should fix issue347. It also highlights one issue with the directory walking code when you have an --include pattern that matches the end of a filename. This is fixed by the next patch.

make the output of test-walk more readable

util.*matcher: change default "names" argument names=['.'] means "include (recursively) only files from the current subdir"; the function then did a hack to walk the whole tree. Clean that up. This also fixes a problem where "--include ." works in a subdir, but not on the tree root.

util._matcher: fix handling of path: patterns

util._matcher: fix handling of relglob: patterns

A 'glob:foo?bar' pattern determines a root - the tree root

Leave normalization of patterns to util._matcher Passing [] to util.cmdmatcher accidentally fixes walking of files with "\n" in the name.