try to load ngsolve in StartGUI python script (fixes failing ngsolve load from tcl in python packages)

python/__main__.py

@@ -12,10 +12,6 @@ def main():
     # Use Redraw without event handling
     netgen.Redraw = netgen._Redraw
 
-    try:
-        import ngsolve
-    except:
-        pass
     from .gui import win
     th = threading.Thread(target=handle_arguments)
     th.start()

python/gui.py

@@ -2,6 +2,13 @@ import netgen
 
 def StartGUI():
     from tkinter import Tk
+    try:
+        # the GUI tries to load ngsolve.tcl (which loads ngsolve shared libraries)
+        # BUT might fail to load dependencies (like mkl), these are handled by the
+        # ngsolve __init__.py script, so import ngsolve from python already here
+        import ngsolve
+    except:
+        pass
 
     global win
     win = Tk()