In single fluid networks fluid specification seems redundant

[fwitte]

It is necessary to specify the fluid in single fluid networks at some point. This seems redundant as the value is clear anyway. To fix this, an issue could arise when checking the number of equations and the number of parameters specified as the number of parameters from fluid specification is not necessarily equal to one in some cases (two sources in the network or two separate paths). To overcome this, the number of sources and cycle closers could be counted, but this needs further checking/thinking.