add glob string creation from pathspec
add catalog::Catalog::LookupGlobString()
add SimpleCatalogManager::LookupPathspec()
add LocatedDirectoryEntry with full path
split Dirtab::IsMatching() into IsMatching() and IsOpposing()
add Dirtab-accessors for rule categories
add Pathspec::GetGlobString() to Pathspec
TEST: unit test for GetGlobString
TEST: unit test for Dirtab::IsOpposing()
replace dirtab processing in cvmfs_server
dirtab processing in cvmfs_swissknife