[v3] Reorganized a bit the basic_string testsuite

[Paolo Carlini]

Hi,

now we have /modifiers/ and /operations/ consistently populated.

Thanks,
Paolo.

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

	* testsuite/21_strings/basic_string/operation/*: Move inside
	testsuite/21_strings/basic_string/operations/data/.
	* testsuite/21_strings/basic_string/compare/*: Move inside
	testsuite/21_strings/basic_string/operations/.
	* testsuite/21_strings/basic_string/find/*: Likewise.
	* testsuite/21_strings/basic_string/rfind/*: Likewise.
	* testsuite/21_strings/basic_string/substr/*: Likewise.