Make Error::is_error() static since it behaves like a static method. Fixes numerous E_STRICT warnings.
Make Error::is_error() static since it behaves like a static method. Fixes numerous E_STRICT warnings.

git-svn-id: d0e296eae3c99886147898d36662a67893ae90b2@645 653ae4dd-d31e-0410-96ef-6bf7bf53c507

dragonmantank/Habari,dragonmantank/Habari,dragonmantank/Habari