tests/test-progress.out

util.copyfiles: don't try os_link() again if it failed before

If the os_link() call on the first file in the directory fails [1],
we switch mode to using shutil.copy() for all remaining files.

[1] happens for example on Windows for every file when cloning from a UNC
path without specifying --pull.

% test default params, display nothing because of delay
% test with delay=0, refresh=0

loop [                                                                    ] 0/3
loop [=====================>                                              ] 1/3
loop [============================================>                       ] 2/3
                                                                                
% test refresh is taken in account
% test format options 1

0/2 loop lo
1/2 loop lo
                                                                                
% test format options 2

0/2 p.0 [                                                                     ]
1/2 p.1 [=================================>                                   ]
                                                                                
% test format options and indeterminate progress

0 loop.0               [ <=>                                                  ]
1 loop.1               [  <=>                                                 ]
                                                                                
% make sure things don't fall over if count > total

loop [                                                                    ] 0/4
loop [================>                                                   ] 1/4
loop [=================================>                                  ] 2/4
loop [==================================================>                 ] 3/4
loop [===================================================================>] 4/4
loop [ <=>                                                                ] 5/4
                                                                                
% test immediate progress completion