Resolve "Load/Save SFG to file"

Save and load sfg to file, preserves positions when loading the sfg into the gui. Also minor fixes to connection etc.

This can't be merged until the __str__ is fixed for some sfgs. Closes #66 (closed)

b_asic/GUI/about_window.py

@@ -7,7 +7,7 @@ QUESTIONS = {
     "Moving operations": "To drag an operation, select the operation on the workspace and drag it around.",
     "Selecting operations": "To select one operation just press it once, it will then turn grey.",
     "Selecting multiple operations using dragging": "To select multiple operations using your mouse, \ndrag the mouse while pressing left mouse button, any operation under the selection box will then be selected.",
-    "Selecting multiple operations using without dragging": "To select mutliple operations using without dragging, \npress 'Ctrl+LMouseButton' on any operation. Alternatively press 'Ctrl+A' to select all operations.",
+    "Selecting multiple operations using without dragging": "To select mutliple operations using without dragging, \npress 'Ctrl+LMouseButton' on any operation.",
     "Remove operations": "To remove an operation, select the operation to be deleted, \nfinally press RMouseButton to bring up the context menu, then press 'Delete'.",
     "Remove multiple operations": "To remove multiple operations, \nselect all operations to be deleted and press 'Delete' on your keyboard.",
     "Connecting operations": "To connect operations, select the ports on the operation to connect from, \nthen select the next port by pressing 'Ctrl+LMouseButton' on the destination port. Tip: You can chain connection by selecting the ports in the order they should be connected.",
@@ -41,7 +41,6 @@ class KeybindsWindow(QDialog):
         self.dialog_layout.addWidget(frame)
 
         keybinds_label = QLabel(
-            "'Ctrl+A' - Select all operations on the workspace.\n"
             "'Ctrl+R' - Reload the operation list to add any new operations created.\n"
             "'Ctrl+Q' - Quit the application.\n"
             "'Ctrl+LMouseButton' - On a operation will select the operation, without deselecting the other operations.\n"