update in-line comments in MD integrator routines

Author: jayponder

other/biotypes.txt

@@ -1044,8 +1044,18 @@ biotype    1253    OP      "3'-Phosphate OP DNA"
 
 biotype    2001    O       "Water"
 biotype    2002    H       "Water"
-biotype    2003    NA      "Sodium Ion"
-biotype    2004    K       "Potassium Ion"
-biotype    2005    MG      "Magnesium Ion"
-biotype    2006    CA      "Calcium Ion"
-biotype    2007    CL      "Chloride Ion"
+biotype    2003    EP      "Water"
+biotype    2004    LI      "Lithium Ion"
+biotype    2005    NA      "Sodium Ion"
+biotype    2006    K       "Potassium Ion"
+biotype    2007    RB      "Rubidium Ion"
+biotype    2008    CS      "Cesium Ion"
+biotype    2009    MG      "Magnesium Ion"
+biotype    2010    CA      "Calcium Ion"
+biotype    2011    SR      "Strontium Ion"
+biotype    2012    BA      "Barium Ion"
+biotype    2013    F       "Fluoride Ion"
+biotype    2014    CL      "Chloride Ion"
+biotype    2015    BR      "Bromide Ion"
+biotype    2016    I       "Iodide Ion"
+biotype    2017    ZN      "Zinc Ion"