Fix/overallmutexcheck (#292)

* read_position_str() is also needed here to keep in sync with easygopigo3

* Query overallmutex flag every single time

Author: CleoQc

Software/Python/easygopigo.py

@@ -19,22 +19,21 @@
 from I2C_mutex import Mutex
 
 mutex = Mutex()
-overall_mutex = mutex.overall_mutex()
 
 def _ifMutexAcquire(mutex_enabled = False):
     """
     Acquires the I2C if the ``use_mutex`` parameter of the constructor was set to ``True``.
     Always acquires if system-wide mutex has been set.
     
     """
-    if mutex_enabled or overall_mutex==True:
+    if mutex_enabled or mutex.overall_mutex()==True:
         mutex.acquire()
 
 def _ifMutexRelease(mutex_enabled = False):
     """
     Releases the I2C if the ``use_mutex`` parameter of the constructor was set to ``True``.
     """
-    if mutex_enabled or overall_mutex==True:
+    if mutex_enabled or mutex.overall_mutex()==True:
         mutex.release()
 
 try: