Keepass import should include root-level entries

Repro steps:
1. In KeePass, add some entries as children of the root node
2. Export the KeePass to foo.xml
3. 'keepass2pass.py -f foo.xml'
Expect: all entries imported
Actual: root-level entries are skipped
Makefile: appropriate mkdir -p for completion

Fix for c832d4647439a0d504a310fba51f20dcb5051c47