Adapted taxis to global resource array. Changed implementation of resources operations to be called with XXX_t pointer args in grid, zaxis and taxis.

Changed argument type of resources print function in reshArrayPrint, introduced XXXPrintKernel with ( mostly ) direct access to XXX members in grid.c and zaxis.c.

This is meant to

* remove code duplication and
* ease maintainability in the face of transferring the same information
  to I/O server processes with consistent handle values.