hgweb: use lrwxrwxrwx as the permissions of a symlink

Make hg add foo; hg mv foo bar work. - foo will be removed (the user has a copy of its contents in bar) - bar will not be marked as a copy (there was no committed version of foo). We print a warning telling that to the user. Fixes issue269.

test-copy2: use status -C instead of debugstate | grep copy

test-rename: use hg status -C; don't use hg debugstate | grep copy

Make hgk handle filenames with spaces (issue49)

Use "--config ui.report_untrusted=false" for hg calls in hgk, fixes issue523. tcl's exec yields an error if output to stderr happens and isn't redirected to a file, so the warnings about untrusted .hg/hgrc caused problems in hgk. The warning is still printed when executing 'hg view', so the user can see it when using it from the shell.