Log Message:
Update from version 1.25nb1 to 1.26.

Upstream changes:

1.26, 13 Oct 2008
    * Methods which destroyed $@ due to internal use of eval now
      properly call local($@) (Yuval)
    * Fix a leak and a corner case with weak set magic, and squash
      some warnings (Yuval)
    * Define behaviour when dealing with return values from operations
      on weak sets. No longer hard-coded "Set::Object" - may affect
      Set::Object sub-classes (Sam)