BBBikeUtil: new function save_pwd2

With tests, also for existing save_pwd.
bbbike.org-download.pl refactoring

Moved most of the code to new module BBBikeOrgDownload.pm.
bbbike.org-download.pl is still backward compatible.
a TODO item less
bbbike_chooser.pl: use BBBikeOrgDownload.pm

This should solve problems on Windows (the listing script call failed
if BBBike was installed under "C:\Program Files" - the space was
disturbing!).
imported new version of Win32Util

This has another fallback for get_user_folder.
bbbikedraw-loop.t: skip if BBBIKE_TEST_SKIP_MAPSERVER is set
cgi: modernized footer html (no align, no <center>)
base.t: fix for WMs with interactive placement
.travis.yml: fixed env specification