Initial %include implementation

[Egor Pugin]

Hi,

I'd like to send initial %include implementation.

For some reason I did not succeed in inserting %include into the
grammar part - so I commented %empty block in epiloque.opt.
Error was:
parse-gram.y:779.3-8: error: rule useless in parser due to conflicts
[-Werror=other]
   %empty
   ^^^^^^

This is not right, maybe someone could help me or fix it in further patches.

I did couple of fast tests locally, but did not include any in the patch yet.
Also I disable some caret code which becomes incorrect with this dummy
implementation.
(I'm very new to C and bison internals. My primary OS is Windows, so

Changes:

* src/files.h, src/files.c: Add include dirs counters, array.
* src/files.h, src/files.c: Add include dirs counters, array.
* src/getargs.c: Add -I (--include) option
* src/location.c: Do not run location_caret() when %include's provided.
* src/parse-gram.y: Implement %include directive.
* src/scan-gram.l: Add %include token.

-- 
Egor Pugin

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