[patch, fortran] Add -fmax-errors option to limit the number of errors emitted.

[Brooks Moses]

PR 23538 mentions the utility of having an option that causes gfortran 
to give up and quit after emitting a certain number of errors.  The 
following patch implements this.

-----------------------------------------------------------------
2006-11-07  Brooks Moses  <brooks.moses@codesourcery.com>

	* lang.opt: Add -fmax-errors= option.
	* gfortran.h (gfc_option_t): Add max_errors element.
	* options.c (gfc_init_options): Set max_errors default value
	to 50.
	(gfc_handle_options): Check -fmax_errors value, assign to
	gfc_option.max_errors.
	* error.c (gfc_increment_error_count): New function, which
	also checks whether the error count exceeds max_errors.
	(gfc_warning): Use it.
	(gfc_notify_std): Use it.
	(gfc_warning_now): Use it.
	(gfc_error): Use it.
	(gfc_error_now): Use it.
	(gfc_error_check): Use it.
	(gfc_warning): Use it.
-----------------------------------------------------------------

Regtested on i686-pc-linux-gnu.  Ok for trunk?

(Once this is approved, I'll submit a corresponding documentation update.)

- Brooks
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