improve petascope error message

[Peter Baumann]

this request:

for c in mean_summer_airtemp
return encode(c,"crs")

seems to return:

WCPS Error: Could not evaluate rasdaman query: 'select crs© from mean_summer_airtemp AS c where oid©=3073' Cause: Error evaluating rasdaman query: 'select crs© from mean_summer_airtemp AS c where oid©=3073

…this (and further?) error messages should be more meaningful to the user. The exceptions should be caught and mapped to some understandable error text.

[Dimitar Misev]

I think we can close this as the WCPS 2.0 implementation has addressed it?

[Peter Baumann]

indeed, closing it therefore.