Implement variable action class in capgen (30 hours)

[climbfuji]

Description

The variable action class (aka var_action) needs to be implemented in capgen. This class will provide the ability to manipulate variables prior to entering physics schemes and posterior to returning from physics schemes.

Solution

The var_action class must support combinations of data manipulations at the same time, for example blocking/de-blocking of arrays and unit conversions. The current implementation in ccpp_prebuild handles this explicitly for each possible combination of data manipulations, which requires a lot of redundant code and is not maintainable going into the future.

Related to (optional)

The var_action class is a requirement for implementing the following items: #314, #329, #348, #349, #325

[gold2718]

These classes are likely to be based on the SuiteObject base class in capgen.

[dustinswales]

@gold2718 @climbfuji
#410 suggests this could be closed, but I'm not uncertain if it was addressed (we still have it in our ToDo list..).
Could you please confirm?

[gold2718]

@dustinswales, I believe this is still planned. @peverwhee?

[peverwhee]

@dustinswales @gold2718 Still planned, #410 addressed it, but the implementation still remains un-done.

[climbfuji]

@dustinswales your PR #504 will resolve this issue, I made the necessary connection.

[climbfuji]

Closed via #504