Python: Add many medium precision queries to the code-quality-extended suite.

python/ql/src/Variables/ShadowBuiltin.ql

@@ -4,8 +4,10 @@
  *              makes the built-in object unusable within the current scope and makes the code
  *              more difficult to read.
  * @kind problem
- * @tags maintainability
+ * @tags quality
+ *       maintainability
  *       readability
+ *       correctness
  * @problem.severity recommendation
  * @sub-severity low
  * @precision medium

python/ql/src/Variables/ShadowGlobal.ql

@@ -4,8 +4,10 @@
  *              makes the global variable unusable within the current scope and makes the code
  *              more difficult to read.
  * @kind problem
- * @tags maintainability
+ * @tags quality
+ *       maintainability
  *       readability
+ *       correctness
  * @problem.severity recommendation
  * @sub-severity low
  * @precision medium

python/ql/src/Variables/UndefinedPlaceHolder.ql

@@ -2,7 +2,8 @@
  * @name Use of an undefined placeholder variable
  * @description Using a variable before it is initialized causes an exception.
  * @kind problem
- * @tags reliability
+ * @tags quality
+ *       reliability
  *       correctness
  * @problem.severity error
  * @sub-severity low

python/ql/src/Variables/UninitializedLocal.ql

@@ -2,7 +2,8 @@
  * @name Potentially uninitialized local variable
  * @description Using a local variable before it is initialized causes an UnboundLocalError.
  * @kind problem
- * @tags reliability
+ * @tags quality
+ *       reliability
  *       correctness
  * @problem.severity error
  * @sub-severity low

python/ql/src/Variables/UnusedParameter.ql

@@ -2,7 +2,10 @@
  * @name Unused parameter
  * @description Parameter is defined but not used
  * @kind problem
- * @tags maintainability
+ * @tags quality
+ *       reliability
+ *       correctness
+ *       readability
  * @problem.severity recommendation
  * @sub-severity high
  * @precision medium