Changelog for OST 1.7.1

CHANGELOG.txt

+Changes in Release 1.7.1
+--------------------------------------------------------------------------------
+
+  * Fixed an issue that could cause the star format parser (mmCIF, chemical
+    components dictionary) to enter an infinite loop
+  * Chemical components dictionary was extended by new chemical classes
+    introduced by PDB
+  * Fixed unit tests
+  * Improved documentation
+
 Changes in Release 1.7
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