tests/test-diff-copy-depth: using sh instead of bash
test failed on plain FreeBSD 6.2 due to nonexistent bash
hg.1: bogus escaping of .hg* not needed anymore
Revert
ba40e267762b,
1c1ef561d541 workarounds.
doc: escape .hg at bol in manpages with make (
issue1072)
This works around a bug in old docbook stylesheets.
Remove .*.swp example from hgignore.5.txt.
Diagnosis and workaround thanks to Alexis S. L. Carvalho.