fix move_storage bug when using fail_if_exist as well as use the boost::system::errc::file_exists as error code for that case

git-svn-id: https://svn.code.sf.net/p/libtorrent/code/trunk@8389 a83610d8-ad2a-0410-a6ab-fc0612d85776
merged fix from RC_0_16

git-svn-id: https://svn.code.sf.net/p/libtorrent/code/trunk@8392 a83610d8-ad2a-0410-a6ab-fc0612d85776
merged fix from RC_0_16

git-svn-id: https://svn.code.sf.net/p/libtorrent/code/trunk@8394 a83610d8-ad2a-0410-a6ab-fc0612d85776
fix typo in move_storage

git-svn-id: https://svn.code.sf.net/p/libtorrent/code/trunk@8395 a83610d8-ad2a-0410-a6ab-fc0612d85776
fix move_storage fail_if_exist logic. First check to see if the root folder exists, as an early exit

git-svn-id: https://svn.code.sf.net/p/libtorrent/code/trunk@8396 a83610d8-ad2a-0410-a6ab-fc0612d85776
merged fixes from RC_0_16

git-svn-id: https://svn.code.sf.net/p/libtorrent/code/trunk@8398 a83610d8-ad2a-0410-a6ab-fc0612d85776
merged changes from RC_0_16

git-svn-id: https://svn.code.sf.net/p/libtorrent/code/trunk@8402 a83610d8-ad2a-0410-a6ab-fc0612d85776
update email in set_version and update changelog

git-svn-id: https://svn.code.sf.net/p/libtorrent/code/trunk@8405 a83610d8-ad2a-0410-a6ab-fc0612d85776