Advice find-function-search-for-symbol to make it namespace aware.

* namespace-srcloc.el ([advice] find-function-search-for-symbol): New.
(advice): Renamed from bind-keys.
(align-loc): New helper.
(locate-name): Use it.
(find-definition): Ask for name when called with prefix arg.
Rename namespace-srcloc.el to namespace-tools.el

* namespace-tools.el:
* Makefile (ELFILES):
Delete namespace-srcloc.el