1.Added IPage class, and add following functions:
1.1,Added following functions to originpro.
new_image(lname='', hidden=False)
find_image(name='')
1.2,Added following functions to IPage class.
from_np(self, arr)
to_np(self)
1.3,Added following function to Page class.
1.4.Support adding 2D symbol and line plot to Image window.
dp = im.layer.addplot(...)