Log Message:
Update global to 6.5.2:

Version 6.5.2 - Dec 16 2015

[CHANGES]
New facilities:
o Improvements of gtags.conf
  - Including from another file: Label syntax is expanded. (:tc=label[@file]:)
  - Variable substitution: B shell like variable substitution is available.
  - Addition of variables: 'bindir', 'datadir', 'libdir' and 'localstatedir'.
    By default, these variables has a value given by the configure script.
  - gtags.conf(5): Online manual of the configuration file.
o global: Now the -N(--nearness) option also works with the -P and -g command
  as well as the tag search command.
o gtags.vim: New custom variable 'Gtags_Close_When_Single' (default 0).
  If this variable is set to 1, quickfix window is closed when single tag.

Changed:
o gtags-cscope: Title changed to reduce misunderstanding.
  Find locations calling this function: -> Find references of this function:

[FIXED BUGS]
o gtags.el: a strange error message in gtags-visit-rootdir was fixed.

	$ cp /dev/null main.c
	$ ls
	main.c
	$ emacs -f gtags-mode main.c
	[Emacs mini buffer]
	M-x gtags-visit-rootdir[ENTER]
	Visit root directory: /tmp/test/[ENTER]
	/tmp/test/main.c is not directory.      <= STRANGE ERROR

o gtags (C, C++): Gtags couldn't handle enums in the case that there are
  newlines between "enum" and " {". Now it can handle correctly.

	+-------------
	|typedef enum
	|{
	|  E_FIRST = 1,
	|  E_SECOND
	|} FIRST_SECOND;
	+-------------
	$ global -x '.*'
	E_FIRST             3 test.h             E_FIRST = 1,
	FIRST_SECOND        5 test.h           } FIRST_SECOND;	<= E_SECOND not found
	$ _

	+-------------
	|enum
	|tag
	|{ ... };
	+-------------
	$ global -x '.*'
	$ _			<= tag not found

o gtags.conf: some part of a comment line (start with '#') was not skipped
  when the line is very large. Now it is skipped correctly.
o gtags: If the DLL path includes ':', loading failed. Now it works.