Fixed Gerber parser: Now buffers current path with previous tool on tool change.

bugs/_sources/active.txt

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+Active Bugs
+===================
+
+Drill number parsing
+--------------------
+
+The screenshot below show the problematic file:
+
+.. image:: drill_parse_problem1.png
+   :align: center
+
+The file reads::
+
+    G81
+    M48
+    METRIC
+    T1C00.127
+    T2C00.889
+    T3C00.900
+    T4C01.524
+    T5C01.600
+    T6C02.032
+    T7C02.540
+    %
+    T002
+    X03874Y08092
+    X03874Y23333
+    X06414Y08092
+    X06414Y23333
+    X08954Y08092
+    ...
+    T007
+    X02664Y03518
+    X02664Y41618
+    X76324Y03518
+    X76324Y41618
+    ...
+
+After scaling by 10.0:
+
+.. image:: drill_parse_problem2.png
+   :align: center
+
+The code involved is:
+
+.. code-block:: python
+
+    def __init__(self):
+        ...
+        self.zeros = "T"
+        ...
+
+    def parse_number(self, number_str):
+
+        if self.zeros == "L":
+            match = self.leadingzeros_re.search(number_str)
+            return float(number_str)/(10**(len(match.group(2))-2+len(match.group(1))))
+        else:  # Trailing
+            return float(number_str)/10000
+
+The numbers are being divided by 10000. If "L" had been specified,
+the following regex would have applied:
+
+.. code-block:: python
+
+    # Parse coordinates
+    self.leadingzeros_re = re.compile(r'^(0*)(\d*)')
+
+Then the number 02664 would have been divided by 10**(4-2+1) = 10**3 = 1000,
+which is what is desired.
+
+Leading zeros weren't specified, but www.excellon.com says:
+
+    The CNC-7 uses leading zeros unless you specify
+    otherwise through a part program or the console.
+
+.. note::
+    The parser has been modified to default to leading
+    zeros.

bugs/_sources/index.txt

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+.. FlatCAM Bugs documentation master file, created by
+   sphinx-quickstart on Thu Nov 13 12:42:40 2014.
+   You can adapt this file completely to your liking, but it should at least
+   contain the root `toctree` directive.
+
+Welcome to FlatCAM Bugs's documentation!
+========================================
+
+Contents:
+
+.. toctree::
+   :maxdepth: 2
+
+   active
+
+
+Indices and tables
+==================
+
+* :ref:`genindex`
+* :ref:`modindex`
+* :ref:`search`
+