Reads a GPX file from path and creates several tables
prefixed by tableName representing the file’s contents.
Which tables are produced depends on the content of the GPX file,
and may include:
TABLENAME_WAYPOINT
TABLENAME_ROUTE
TABLENAME_ROUTEPOINT
TABLENAME_TRACK
TABLENAME_TRACKPOINT
TABLENAME_TRACKSEGMENT
By default, the tableName is the filename given in path without
the extension.