Normalize DIR_FS_CATALOG containing a trailing slash
This was needed under PHP 5.5.11 (x64) on Windows to avoid is_dir() calls
with double slashes from failing. Without these changes, attempting to
access the administrative interface frequently displayed the setup message.
Merge remote-tracking branch 'fork/v160' into normalize-slashes-filelocations
Merge remote-tracking branch 'fork/v160' into normalize-slashes-filelocations
Merge pull request #47 from lhungil/normalize-slashes-filelocations

Normalize DIR_FS_CATALOG to contain a trailing slash