Trac #26865: remove the deprecated piecewise_old module

after #14801

URL: https://trac.sagemath.org/26865
Reported by: chapoton
Ticket author(s): Frédéric Chapoton
Reviewer(s): Jeroen Demeyer

Author: Release Manager

src/sage/functions/all.py

@@ -2,7 +2,6 @@
 
 from sage.misc.lazy_import import lazy_import
 
-lazy_import('sage.functions.piecewise_old', 'Piecewise')   # deprecated
 lazy_import('sage.functions.piecewise', 'piecewise')
 lazy_import('sage.functions.error', ['erf', 'erfc', 'erfi', 'erfinv',
     'fresnel_sin', 'fresnel_cos'])
@@ -21,7 +20,6 @@
 reciprocal_trig_functions = {'sec': cos, 'csc': sin, 'cot': tan, 'sech': cosh, 'csch': sinh, 'coth': tanh}
 
 
-
 from .other import ( ceil, floor, abs_symbolic, sqrt,
                     arg, real_part, real, frac,
                     factorial, binomial,