Upgrade PL/1 compiler to V. 3.3

All the host programs (batch and online) created in PL/1 are migrated from Compiler version 2.3 to version 3.3 in two main steps. In the course of the first mass compiles, any modules that cannot be translated without errors are to be separated out and the error messages are analyzed, evaluated, categorized and prioritized. Depending on the type of error, there is then an automatic clean-up of modules by means of Perl scripts that are to be created, or by manual cleanup. The former rectifies problems of a more technical nature, the latter deals with issues where the functional context is important. The go-live for all migrated modules takes place after an appropriate testing phase, as per the big bang method. Difficulties with performance of the batch operation for a few programs result in the need for temporary parallel operation of the old and newly translated modules.