Dimensions and values for properties (p,U,T)

[ksathish12]

1. Keep the dimensions for velocity as [0 1 -1 0 0 0 0], pressure as [0 2 -2 0 0 0 0] and temperature as [0 0 0 1 0 0 0] as default.
2. Make the "uniform" as separate drop down, so that user need not enter "uniform" for every value.
   Have the entries for velocity as x,y z separately.
   For example,
   If the user selects "uniform" from the drop down provided and enters 20 in x and 0 in y and z, it should take it as uniform (20 0 0)
   Similarly for pressure, if the user selects "uniform" from drop down provided and enters 20, it should take it as uniform 20
   Same thing for Temperature, similar to the Pressure.
3. The above point is for fixedValue condition.