ascope.el --with cache save `find' history

[Wang Lei]

Hi, all!

When using ascope.el, I find that something I `find' again and again.
To save the work, I enhance ascope.el with cache.

The cache is a hash table, KEY is the symbol which is looked at, VALUE
is a list as '(buffer file point). Before emacs exits, the cache will
be saved to a file in the same directory with cscope.out. It may be
loaded in next emacs session.

It's attached. Please review.

--
Regards,
Lei

ascope.el
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