run-tests.py: tell coverage.py to ignore errors
Otherwise there'll be some IOErrors when it tries to open python
files created during the execution of e.g. test-hook.
#!/bin/sh
mkdir t
cd t
hg init
echo a > a
hg add a
hg commit -m test -d "1000000 0"
rm .hg/requires
hg tip
echo indoor-pool > .hg/requires
hg tip
true