add an option to specify if the code generated by 'language' should be understood as being a generator of meta-commands, and then automatically executed in the latter case


git-svn-id: https://projects.brucker.ch/hol-testgen/svn/HOL-TestGen/trunk/hol-testgen@13502 3260e6d1-4efc-4170-b0a7-36055960796d