New features

This is a stable version including the following features:

The CCP3D has been added to this module, suitable for calculated mantle transition structure. Please refer to Xu et al., 2018.
We have written the rfani.py for estimating crustal anisotropy using a joint method in Liu and Niu 2012.
We write a ccpprofile.py instead of the ccp.py. The ccp_profile was rewritten to a class.
New criteria have been added to RF:
- Remove RFs with final RMS large than rmsgate.
- Remove RFs with summed energy after 5s less than 0.1.
Add Water level deconvolution in decon.py.
Add LQT option in command prf.
pickrf now supporting virtual check with the only R component.

Bug fix

Fix bugs in CCP stacking when stack_val is not equal to dep_val.
Fix bugs in associating data and events when reference time in SACHeader is the origin time.