bug#20629: 25.0.50; Regression: TAGS broken, can't find anything in C++ files.

[Francesco Potortì]

>Another thing to consider is the possibility of merging Ex-Ctags and 
>Etags in the future. Compatible behaviors would make it easier on the users.

In fact, Exhuberant-ctags and Etags are very different, internally.
Etags is faster (which nowadays is not that important) and creates
optimised TAGS files (which nowadays is not that important).  Ex-ctags
generates new-style ctags tags and can recurs directories, both of which
would be easy to implement in Etags.

When I compared them, more than ten years ago, the quality of generated
tags were comparable.  I don't know if things have changed in the
meantime, but I don't think that they have changed a lot.  The code of
Ex-ctags is much more structured and, at a first sight, readable.
However, I have never tried to go deeply into it, so I don't know if, in
fact, it is really easier to manage.

So "merging" would mean, in fact, to have the communities managing them
agree on one of them and improve it so that it becomes a superset of the
other, then officielly declare the other one as deprecated.