mailmap: add Tobin Isaac ("Toby Isaac")
KSP: fix PIPECG for norm types PRECONDITIONED and UNPRECONDITIONED

Norm type NATURAL and NONE did not need fixing.  This bug did not appear
in the initial patch from Pieter Ghysels, but was introduced by
overzealous reformatting.
Merge branch 'maint'

* maint:
  KSP: fix PIPECG for norm types PRECONDITIONED and UNPRECONDITIONED
Fix PetscObjectDestroyOptionsHandlers() to support missing destroy function
Merge branch 'dalcinl/opthandlers-destroy'

* dalcinl/opthandlers-destroy:
  Fix PetscObjectDestroyOptionsHandlers() to support missing destroy function
Merge branch 'master' into next

* master:
  Fix PetscObjectDestroyOptionsHandlers() to support missing destroy function
  KSP: fix PIPECG for norm types PRECONDITIONED and UNPRECONDITIONED
  mailmap: add Tobin Isaac ("Toby Isaac")