Knob to allow alternative formatting of call chains

In addition to the standard method of getting call chains formatted like this:
```
rawKPIs = KPIsSession.query(
KPI.name, KPI.value, KPI.created
).filter(KPI.entryId == entryID).filter(KPI.subsetId is None).filter(
KPI.created >= fromUnixTimestamp(fromTimestamp)
).filter(KPI.created <= fromUnixTimestamp(toTimestamp)).filter(
func.unix_timestamp(KPI.created) % moduloSelector == 0
).order_by(KPI.name, KPI.created).all()
```

Allow formatting as:
```
rawKPIs = \
KPIsSession.query(
KPI.name, KPI.value, KPI.created
).filter(
KPI.entryId == entryID
).filter(
KPI.subsetId is None
).filter(
KPI.created >= fromTimestamp
).filter(
KPI.created <= toTimestamp
).filter(
KPI.created % moduloSelector == 0
).order_by(
KPI.name, KPI.created
).all()
```

or:
```
rawKPIs = \
KPIsSession.query(KPI.name, KPI.value, KPI.created) \
.filter(KPI.entryId == entryID) \
.filter(KPI.subsetId is None) \
.filter(KPI.created >= fromTimestamp) \
.filter(KPI.created <= toTimestamp) \
.filter(KPI.created % moduloSelector == 0) \
.order_by(KPI.name, KPI.created) \
.all()
```

This makes the code more readable and stack traces clearer. (due to line number)