added WaptHostRepo to manage wapt-host repository more efficiently without Packages index
moved update_packages_list to update_db in WaptRepo class
bugfix runstatus if remove fails
build_upload can manage several directories in one pass
build_upload uploads to wapt-host repository if section of the package is host.  "-host" is appended to main repo URL.  use %(waptdir)s placeholder in uplaod_cmd and after_upload shell commands to get location of uploads