rpmteDBOffset() is perfectly legal for TR_ADDED too, fix the docs

rpmteDBOffset() simply returns zero for non-installed packages, which
is actually useful for determining whether a TR_ADDED package has
already been installed or not, rpm even relies on this. Remove a couple
of other questionable TR_REMOVED comments too.

lib/rpmte.h

@@ -167,23 +167,23 @@ void rpmteCleanProblems(rpmte te);
 void rpmteCleanDS(rpmte te);
 
 /** \ingroup rpmte
- * Set dependent element of TR_REMOVED transaction element.
+ * Set dependent element of transaction element.
  * @param te		transaction element
  * @param depends       dependent transaction element
  */
 void rpmteSetDependsOn(rpmte te, rpmte depends);
 
 /** \ingroup rpmte
- * Retrieve dependent element of TR_REMOVED transaction element.
+ * Retrieve dependent element of transaction element.
  * @param te		transaction element
  * @return		dependent transaction element
  */
 rpmte rpmteDependsOn(rpmte te);
 
 /** \ingroup rpmte
- * Retrieve rpmdb instance of TR_REMOVED transaction element.
+ * Retrieve rpmdb instance of transaction element.
  * @param te		transaction element
- * @return		rpmdb instance
+ * @return		rpmdb instance (0 if not installed))
  */
 int rpmteDBOffset(rpmte te);
 

python/rpmte-py.c

@@ -30,7 +30,7 @@
  * - te.PkgFileSize() Return no. of bytes in package file (approx).
  * - te.Parent() Return the parent element index.
  * - te.Problems() Return problems associated with this element.
- * - te.DBOffset() Return the Packages database instance number (TR_REMOVED)
+ * - te.DBOffset() Return the Packages database instance number
  * - te.Key()	Return the associated opaque key, i.e. 2nd arg ts.addInstall().
  * - te.DS(tag)	Return package dependency set.
  * @param tag	'Providename', 'Requirename', 'Obsoletename', 'Conflictname'
@@ -220,7 +220,7 @@ static struct PyMethodDef rpmte_methods[] = {
     {"Problems",(PyCFunction)rpmte_Problems,	METH_NOARGS,
      "te.Problems() -- Return problems associated with this element."},
     {"DBOffset",(PyCFunction)rpmte_DBOffset,	METH_NOARGS,
-     "te.DBOffset() -- Return the Package's database instance number.\n\nTR_REMOVED only"},
+     "te.DBOffset() -- Return the Package's database instance number.\n"},
     {"Failed",	(PyCFunction)rpmte_Failed,	METH_NOARGS,
      "te.Failed() -- Return if there are any related errors."},
     {"Key",	(PyCFunction)rpmte_Key,		METH_NOARGS,