Warn when people (or scripts) use numeric identifiers for TAPs,
instead of dotted.name values.  We want this usage to go away,
so that for example adding more TAPs doesn't cause config scripts
to break because some sequence number changed.

It's been deprecated since late 2008, but putting a warning on
this should help us remove it (say, in June 2010) by helping to
phase out old (ab)usage in config scripts.

Other than in various config files, the only code expecting such
a number was the almost unused str9xpec driver.  This code was
changed to use the TAP it was passed, instead of making its own
dubious lookup and ignoring that TAP.


git-svn-id: svn://svn.berlios.de/openocd/trunk@2415 b42882b7-edfa-0310-969c-e2dbd0fdcd60