* The corresponding faults only happen when reshReplace results in a
  non-contiguous list or a non-contiguous list is extended.

* Fixes an implicit conversion.

* The actual value is only relevant when ioMode != PIO_NONE.

Fail early instead.

Fail early instead.

Fail early instead.

Fail early instead.

Fail early instead.

* Also fixes implicit type conversion of strlen return value.

* The filetype-specific DefRecord functions fail by calling Error if a
  record cannot be created.

* cdf_write_var_slice will never return an error code but call
  on internal error handling.