Three changes:

CURRENTLY IMPORTING: a new field.
This field is used by PATCH^A1AECL1 to decide whether to populated when
we actually release a patch out of the door.

DERIVED FROM PATCH is now spelled correctly.

STATUS OF PATCH has more extensive Description an Technical Description
to document how it is now supposed to work in the new design for PM 2.4.
New Routine subfile in the DHCP Patch Stream file.

Routine subfile supports calculating and appending the Before Checksum
for KIDS builds issued from the Patch Module. It enables us to produce
valid checksums for different streams, as routines issued from different
streams may differ.

The main two entry points that refer to this subfile are:
$$BCS^A1AEUTL2
$$RTNLOG^A1AECL1