Test framework to check up front if data set HLQ will produce data set names that are too long (> 44 chars)

[ghannington]

The environment variable GERS_TEST_HLQ is used when generating the data sets for the regressions tests. Some of the data set names generated can be quite long. We saw an error when testing the build system with a GERS_TEST_HLQ longer than 11 characters - a dynamic allocation error during start up of gerstf. It took a while to figure out what the problem was.
It would be nice if gerstf caught the problem and issued a message.