revert changes to set <PackageName>_ROOT

Pmodules/libmodules.tcl

@@ -154,9 +154,6 @@ proc _pmodules_setenv { PREFIX name version } {
 		if { [lsearch ${::dont-setenv} "${NAME}_HOME"] == -1 } {
 			setenv		${NAME}_HOME		$PREFIX
 		}
-		if { [lsearch ${::dont-setenv} "${NAME}_ROOT"] == -1 } {
-			setenv		${NAME}_ROOT		$PREFIX
-		}
 	} else {
 		debug "$PREFIX is not a directory"
 	}

Pmodules/modulefile

@@ -9,11 +9,6 @@ module-help	"
 Pmodules are a hierarchical module environment based on Environment Modules.
 "
 
-#
-# Pmodules >= 1.0.0rc11 set <PackageName>_ROOT
-# But for Pmodules PMODULES_ROOT != PMODULES_DIR and should not be set.
-# 
-set dont-setenv { "PMODULES_ROOT" }
 #
 # It might be that '${PMODULES_ROOT}/Tools/Pmodules/VERSION' is in PATH.
 # Why? With older version the PATH might have been set without loading