maint: remove old TODO files

* lib/TODO: Remove file.
* tests/join/TODO: Likewise.

lib/TODO

@@ -1,40 +0,0 @@
-Things to do to hash.c:
-
-Always use curly braces around statements in if/else/while/do/etc.
-that span more than a line -- even around multiline simple statements
-or single-line simple statements preceded by a comment line.
-
-Never have lines longer than 80 chars.
-
-Remove ^L characters.  We don't want/need such crutches.
-Get a good (smart) pagination filter.  I have one (a perl script)
-that usually does a decent job for me -- I called it something
-like stdc-print and think I sent you an early verison.
-
-I don't like the name `cursor'.  I much prefer short names
-like `p' for index variables.  I doubt I'll change all of them,
-but thought you should know why some will probably end up changing.
-
-#define USE_OBSTACK somewhere
-
-Fix this comment.  Depending on system and application...
-Mention fragmentation.
-  +#if USE_OBSTACK
-  +    /* Whenever obstacks are used, it is possible to allocate all overflowed
-  +       entries into a single stack, so they all can be freed in a single
-  +       operation.  It is not clear if the speedup is worth the trouble.  */
-  +    struct obstack entry_stack;
-  +#endif
-
-
-assert (bucket_limit - bucket == n_buckets) ?
-
-remove.c: s/done/successful or ok
-
-
------
-Copyright (C) 1998 Free Software Foundation, Inc.
-
-Copying and distribution of this file, with or without
-modification, are permitted provided the copyright notice
-and this notice are preserved.

tests/join/TODO

@@ -1,2 +0,0 @@
-rename tr-tests
-make sure all test_names are distinct!