PUB-548 - fixed auto framing issue with airlines. The bug was that NewChunk was treating as zero any value with 0 mantissa, not looking at the exponent. Enum value can have 0 mantissa and non-zero exponent (and is not zero).
Fix in GLM2 - error message was being overwritten by "cancelled by user message" as the the task which got the exception cancels the job (with appropriate error message) and others then overwrote it with cancelled by user message (as it appeared to them).

Changed it so that vlm tasks only cancel the job if it's not cancelled already.
Merge branch 'master' of github.com:0xdata/h2o