1.6.2-30: Update Changes.txt, increment patch level

Author: houckj

Changes.txt

@@ -57,6 +57,7 @@ Changes since 1.6.2 (released Jan 2012)
      following the 1.0.8 release), but the workaround is
      apparently no longer needed.
 29.  cache_fun now supports caching of operator models.
+30.  Updates to support heasoft-6.16
 
 Changes since 1.6.1 (released Jul 2010)
 ---------------------------------------

src/isis.h

@@ -36,7 +36,7 @@ extern "C" {
 #include <slang.h>
 
 #define ISIS_VERSION          10602
-#define ISIS_VERSION_STRING  "1.6.2-29"
+#define ISIS_VERSION_STRING  "1.6.2-30"
 #define ISIS_VERSION_PREFIX   1.6.2
 
 #define ISIS_API_VERSION 6