修改python模块引用方式

pyat/tlcore.py

@@ -1,9 +1,9 @@
 import numpy as np
-from pyat.AcousticPara import GetEnv, Coord
-from pyat.DataBase import DataBase
-from pyat.bellhop import call_Bellhop
-from pyat.krakenc import call_krakenc
-from pyat.ram import call_ram
+from AcousticPara import GetEnv, Coord
+from DataBase import DataBase
+from bellhop import call_Bellhop
+from krakenc import call_krakenc
+from ram import call_ram
 import matplotlib.pyplot as plt
 
 def call_tl(database, freq, sourceDepth, sourceLat, sourceLon, receiveDepth,