Merge remote-tracking branch 'upstream/master' into newcellstotexfixes2

Author: mmatera

CHANGES.rst

@@ -26,7 +26,7 @@ Enhancements
   ``Compile[] and CompiledFunction[]``  every expression can have a compiled form,
   as a Python function.
 * ``Equal[]`` now compares complex against other numbers properly.
-
+* Improvements in handling products with infinite factors: ``0 Infinity``-> ``Indeterminate``, and ``expr Infinity``-> ``DirectedInfinite[expr]``
 
 Bug fixes
 +++++++++

mathics/autoload/settings.m

@@ -7,12 +7,12 @@
 Unprotect[Settings`$TraceGet]
 
 
-Settings`$PreferredBackendMethod::usage = "Set this do whether to use mpmath, numpy or Sympy for numeric and symbolic constants and methods when there is s choice";
+Settings`$PreferredBackendMethod::usage = "Set this do whether to use mpmath, numpy or Sympy for numeric and symbolic constants and methods when there is a choice";
 Settings`$PreferredBackendMethod = "sympy"
 Unprotect[Settings`$PreferredBackendMethod]
 
 (* Some packages like Feyncalc, test for whether a they are being used
 inside a notbook. *)
-System`$Notebooks::usage = "Set True if the Mathics is being used with a notebook‐based front end.";
+System`$Notebooks::usage = "Set True if the Mathics is being used with a notebook-based front end.";
 System`$Notebooks = False;
-Unprotect[System`Notebooks];
+Unprotect[System`$Notebooks];