Log Message:
Update to 6.5.1:

Version 6.5.1 - Sep 15 2015

[CHANGES]
New facilities:
o gtags(c, c++): New environment variable GTAGSFORCEENDBLOCK.
  If this variable is set, each '}' at the first column brings
  end of all blocks.
o gtags: New --skip-unreadable option.
  If this option is specified, gtags skips unreadable files
  instead of exiting the command.

[FIXED BUGS]
o gtags: There was a difference of interpretation of the langmap
  between gtags and ctags. Now there is no difference.

o gtags (C++): Gtags did not pick up 'my_type1' as a definition
  in the following example:
	[xxx.cpp]
	+------------------------
	|using my_type1 = double;
  Now it picks up the symbol as a definition.

o gtags (C++): gtags picked up 'DomainId_t' as a definition
        in the following example:
	[xxx.cc]
	+------------------------
        |typedef std::map<DomainId_t, int> map_t2;
  Now it does not pick up it as a definition.

o gtags (C, C++): Gtags did not pick up 'pr_debug' as a definition
  in the following example:
	[xxx.h]
	+------------------------
	|extern void dump_stack(void) __cold;
	|#define pr_debug() printk()
  Now it picks up it as a definition.

o gtags (PHP): Gtags did not treat back-quote correctly.
	[xxx.php]
	+------------------------
	|<?php `ls $echo ~/*`; ?>
  Now it works.

[INCOMPATIBLE CHANGES]
o gozilla: Now, gozilla invokes firefox as a generic browser, that is, using
  command line 'firefox url'. Because firefox have removed the -remote command
  since version 39.