-Added makefile for package install.

-added some missing comments in liquify.tcl

Makefile

@@ -0,0 +1,18 @@
+installdir=${HOME}/vmdplugins/liquify
+
+all:
+	@echo "Nothing to build"
+
+install: liquify.tcl pkgIndex.tcl vmdrc
+	@echo "Copying files..."
+	mkdir -p ${installdir}
+	cp liquify.tcl ${installdir}/
+	cp pkgIndex.tcl ${installdir}/
+	cp vmdrc ${HOME}/.vmdrc
+
+pkgIndex.tcl:
+	@echo "Generating pkgIndex.tcl ..."
+	( echo pkg_mkIndex . liquify.tcl ) | tclsh
+
+clean:
+	rm pkgIndex.tcl

liquify.tcl

@@ -532,7 +532,7 @@ proc ::liquify::check_overlap {test_data_wrapped placed cog diam} {
 }
 
 #
-#
+# Write a XSC file used by NAMD to setup PBC
 #
 proc ::liquify::write_xsc {} {
 	variable options
@@ -553,7 +553,7 @@ proc ::liquify::write_xsc {} {
 }
 
 #
-#
+# Calculate the density of the active molecule
 #
 proc ::liquify::calc_density {} {
 	set resids [lsort -integer -unique [[atomselect top all] get resid]]
@@ -586,7 +586,7 @@ proc ::liquify::random_xyz {} {
 }
 
 #
-#
+# Return a random angle
 #
 proc ::liquify::random_angle {} {
 	return [expr (360.0 * rand())]