merge new pull requests from FlatCAM->master

implement  executing of tasks  inside worker thread
cleanups, reimplement  Isolate/New/OpenGerber as OOP style Shell commands
disable edit  during shell execution,  show   some  progress
add ability for breakpoints in other threads and only if available
add X11 safe flag, not sure what happen on windows

termwidget.py

@@ -4,7 +4,7 @@ Shows intput and output text. Allows to enter commands. Supports history.
 """
 
 import cgi
-
+from PyQt4 import QtCore
 from PyQt4.QtCore import pyqtSignal
 from PyQt4.QtGui import QColor, QKeySequence, QLineEdit, QPalette, \
                         QSizePolicy, QTextCursor, QTextEdit, \
@@ -113,6 +113,32 @@ class TermWidget(QWidget):
 
         self._edit.setFocus()
 
+    def open_proccessing(self, detail=None):
+        """
+        Open processing and disable using shell commands  again until all commands are finished
+        :return:
+        """
+
+        self._edit.setTextColor(QtCore.Qt.white)
+        self._edit.setTextBackgroundColor(QtCore.Qt.darkGreen)
+        if detail is None:
+            self._edit.setPlainText("...proccessing...")
+        else:
+            self._edit.setPlainText("...proccessing... [%s]" % detail)
+
+        self._edit.setDisabled(True)
+
+    def close_proccessing(self):
+        """
+        Close processing and enable using shell commands  again
+        :return:
+        """
+
+        self._edit.setTextColor(QtCore.Qt.black)
+        self._edit.setTextBackgroundColor(QtCore.Qt.white)
+        self._edit.setPlainText('')
+        self._edit.setDisabled(False)
+
     def _append_to_browser(self, style, text):
         """
         Convert text to HTML for inserting it to browser