Release/save aps

[mahmud1]

• APS parameters are saved in step 3.
• Pixels are selected in step 4.
• APS is interpolated in step 4.

[Andreas-Piter]

Thanks for implementing it! I found a few locations where more changes need to be applied.

• [ ] The mask is currently only applied for spatiotemporal unwrapping and not for spatial unwrapping. We should probably merge the two functions into one and switch between them with if-else. (We can do the same for step 2.)
• [x] In step 4, the APS parameters are read from file, but the type of interpolation (kriging or linear/cubic) is decided based on the config parameters of step 3. The interpolation method should be chosen only depending on the available APS parameters.
• [x] Skip filtering in step 4 automatically if no APS parameters are available.
• [x] the cohXX_aps.h5 should not be saved. It is not needed. p1_aps.h5 can be used for visualization.

The merge has to be done carefully, as several changes have been applied in parallel for the densification step.

[mahmud1]

* [ ]  Skip filtering in step 4 automatically if no APS parameters are available.

In step 3, aps_parameters.h5 is created, regardless of whether skip_filter is true or false. In step 4, filtering is applied/not applied based on information in aps_parameters.h5.