Modifications of output writers for compatibility of reference results
- fields ending "_p0" or "_p1" renamed to "_elements", resp. "_nodes"
- NumberOfComponents dropped for scalar fields
- tensor fields omitted
Fix of output time for steady flow.
- time inf changed to 0 in output writers
New output for Darcy flow.
Fixed output in transport classes.
- ConvectionTransport: output field names appended with "_mobile" for compatibility of reference results
- fixed parallel code
Merge branch 'JH-output' into JS_output

Conflicts:
	src/io/output.h