better file names

[wangleiphy]

use more generic file names:

model_1DLR.py -> model.py
pcmpo_1Dlongrange.py -> cmpo.py
cmpo_1Dlongrange_TMRG.py -> power_projection.py (note this is not TMRG, also change it in the source code)
cmpo_1Dlongrange_read.py -> postprocess.py