Sets scp_editdate to 9/1/1994 and scp_instdate to 10/1/1994
for all sc_prog records that start with 00053,
that is with scp_schnum==00053.
Description:
xlset reads a 4C data file sequentially and sets fields in the
rcds based on -v and -r options.
Each -v option specifies a field to set a value for, and
the corresponding -r option specifies the value to set it to.
This is a quick way to reset test data when debugging.