Added fitting with lmfit (#128)

- added stand alone fitting using:
https://jugit.fz-juelich.de/mlz/lmfit.git
- fit_gaus, fit_pol1 with and without errors
- multi threaded fitting

---------

Co-authored-by: JulianHeymes <julian.heymes@psi.ch>

python/aare/__init__.py

@@ -10,8 +10,14 @@ from ._aare import hitmap
 
 from ._aare import ClusterFinderMT, ClusterCollector, ClusterFileSink, ClusterVector_i
 
+from ._aare import fit_gaus, fit_pol1
+
 from .CtbRawFile import CtbRawFile
 from .RawFile import RawFile
 from .ScanParameters import ScanParameters
 
-from .utils import random_pixels, random_pixel
+from .utils import random_pixels, random_pixel, flat_list
+
+
+#make functions available in the top level API
+from .func import *

python/aare/func.py

@@ -0,0 +1 @@
+from ._aare import gaus, pol1

python/aare/utils.py

@@ -20,4 +20,8 @@ def random_pixel(xmin=0, xmax=512, ymin=0, ymax=1024):
     Returns:
         tuple: (row, col)
     """
-    return random_pixels(1, xmin, xmax, ymin, ymax)[0]
+    return random_pixels(1, xmin, xmax, ymin, ymax)[0]
+
+def flat_list(xss):
+    """Flatten a list of lists."""
+    return [x for xs in xss for x in xs]