master updated (96c8e4f -> 3843711)

[Paul Eggert]

eggert pushed a change to branch master.

      from  96c8e4f   Fixes bug where restoring game saved in an endgame 
question room would show 'nil' as the question.
       new  5ab2940   Don’t signal overflow for (expt 1 bignum)
       new  799d738   Overflow errors are range errors
       new  3843711   Simplify calculator-expt


Summary of changes:
 doc/lispref/errors.texi    |  8 ++++----
 etc/NEWS                   |  5 +++++
 lisp/calculator.el         | 28 ++++------------------------
 src/data.c                 | 31 +++++++++++++++++++++++--------
 test/src/floatfns-tests.el |  5 +++++
 5 files changed, 41 insertions(+), 36 deletions(-)