rasql should output scalar results to a file on --out file

[Dimitar Misev]

Specifying --out file in rasql has no effect if the results are scalars, the result is simply printed to stdout:

$ rasql -q 'select 1' --out file
rasql: rasdaman query tool v1.0, rasdaman 9.7.0.
Opening database RASBASE at localhost:7001... ok.
Executing retrieval query... ok.
Query result collection has 1 element(s):
  Result element 1: 1
rasql done.

This inconsistency should be fixed, —out file should be handled in the same way as for array results. Same should be ensured for minterval/sinterval and point results.