(issue1753) Implement PDF export of SQ Measurement data. The SQRelationExporter now consists of two reports (to avoid subreport woes). The old SQReleation PDF only takes the Page count of the Measurement attachment as argument to correctly print the page numbers. Otherwise it is unchanged. The new SQMeasurements report lists the measured data points on which the calculation was based.

next.gauge.id = \
    SELECT GAUGES_ID_SEQ.NEXTVAL AS gauge_id FROM DUAL
next.timeinterval.id = \
    SELECT TIME_INTERVALS_ID_SEQ.NEXTVAL AS time_interval_id FROM DUAL
next.discharge.id = \
    SELECT DISCHARGE_TABLES_ID_SEQ.NEXTVAL AS discharge_table_id FROM DUAL
next.discharge.table.values.id = \
    SELECT DISCHARGE_TABLE_VALUES_ID_SEQ.NEXTVAL AS discharge_table_values_id FROM DUAL