FV3 is not able to apply DA increment when cold staring

[pjpegion]

Currently, the ability to read in an analysis increment is inside the warm_start section of the code. So if a user tried to apply an increment to the initial condition, the model runs, but nothing is applied.
The solution is to move the call to read_da_inc outside the if external_ic/restart logic.

[bensonr]

PR #340 merged into dev/emc