*: Move inside testsuite/21_strings/basic_string/modifiers/.

2013-06-27  Paolo Carlini  <paolo.carlini@oracle.com>

	* testsuite/21_strings/basic_string/append/*: Move inside
	testsuite/21_strings/basic_string/modifiers/.
	* testsuite/21_strings/basic_string/assign/*: Likewise.
	* testsuite/21_strings/basic_string/insert/*: Likewise.
	* testsuite/21_strings/basic_string/replace/*: Likewise.
	* testsuite/21_strings/basic_string/modifiers/pop_back/char/
	pop_back.cc: Rename to 1.cc.
	* testsuite/21_strings/basic_string/modifiers/pop_back/wchar_t/
	pop_back.cc: Likewise.
	* testsuite/ext/vstring/assign/*: Move inside
	testsuite/ext/vstring/modifiers/.

From-SVN: r200465