bugfix: SUBST/JOIN: bad handling of command line arguments
chg: adjustment for SUPPL v2.7
chg: external command names starting with '_' now start with '-'
chg: If SWSUBST is invoked without the '/A' option and the CDS table is
	printed, only used and the last entries will be displayed
fix: Novell Netware adds 6 phantom drives to LASTDRIVE
chg: rename file ERROR.C into YERROR.C
version3:
chg: better detection of local paths in "swsubst dr path"
bugfix: calling format "swsubst dr -" or "swsubst dr /d"
add: unit swapping, to enable the swapping of floppies
add: disk cache flushing for SMARTDRV v3 and v4,& HyperDisk v4.56
bugifx: "subst /d" emits help screen

version2:
add: search/display the driver chain
add: search/display the MCB chains
bugfix: "/w" command
add: German NROFF doc files
add: '/x=' option to exclude drives from being searched while ::label:

version1:
intial revision
