Make tests work on Solaris: - replacement for mktemp - fall back if shell arithmetic doesn't work - replacement for 'set -x' (which results look different with some shells) - "FOO=bar; export FOO" instead of "export FOO=bar" - don't use 'if ! ...'

\.orig$
\.rej$
~$
\.so$
\.pyc$
\.swp$
^tests/.*\.err$
^build/
^dist/
^doc/.*\.[0-9]$
^MANIFEST$
^\.pc/
^patches/
^mercurial/__version__.py$