convert: disable current --filemap support
The --filemap support in hg convert doesn't handle merges correctly.
(And after 33015dac5df5 I managed to break it even for simple cases
where we don't want the first revision.)
#!/bin/sh
echo '[Section]' >> $HGRCPATH
echo 'KeY = Case Sensitive' >> $HGRCPATH
echo 'key = lower case' >> $HGRCPATH
hg showconfig Section