adds dynamic aperture example

examples/example_da/example_pyat_da.py

+# This python script calculates the dynamic aperture using getacceptance
+# and saves the output in a hdf5 file.
+# orblancog 2023aug15
+
+import at
+from at.load import load_mat
+import numpy
+import datetime
+from pyatsoleiloutils import get_da_SOLEIL_II, savedahdf5
+
+fin = 'file.mat';
+ring = load_mat(fin);
+
+[_, beamdata, _] = at.get_optics(ring, get_chrom=True)
+print(f'filename         =\t{fin}')
+print(f"ringname         =\t{ring.attrs['name']}")
+print(f'tune             =\t{beamdata.tune}')
+print(f'chromaticity     =\t{beamdata.chromaticity}')
+
+nturns=10
+da_boundary = get_da_SOLEIL_II(ring,nturns=nturns)
+
+# sets output filename
+tnow = datetime.datetime.now()
+foname = 'da' + tnow.strftime("%Y%h%d_%Hh%Mm%S") + '.hdf5'
+
+savedahdf5(foname,nturns=nturns,boundary=da_boundary)
+
+#xx = da_boundary[0][:]
+#yy = da_boundary[1][:]
+#plt.plot(xx, zz)
+#plt.show()
+
+# all done
+