core: add hpi query command (#157)

- restructure query code for cli, some test fixes
- initial query_range implementation

    refactored functions in query some more
    to allow re-use in range_range, select()
    pretty much just calls out to a bunch
    of handlers now

my/taplog.py

@@ -6,7 +6,7 @@ from datetime import datetime
 from typing import NamedTuple, Dict, Optional, Iterable
 
 from .core import get_files
-from .core.common import fromisoformat
+from .core.compat import fromisoformat
 
 from my.config import taplog as user_config