A ZCPR3 rework of Irv Hoff's FILT7 that sets or expands tabs and 
removes several types of unwanted characters in ASCII text, 
WordStar documents, or assembler source code files.  Command line 
operation, DU and DIR support, error flag setting, error handler 
invocation, quiet mode, and ZCNFG configuration.  ZSDOS file 
create date stamps are preserved.  Version 8.1 fixes a long- 
standing bug and adds a display option.