Add import tool and split notes into per-month files

meeting_notes/2018/2018_03_mar.md

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+# Matplotlib Weekly Meeting: March 2018
+
+###### tags: `2018 dev call`
+
+---
+
+# March 26, 2018
+
+- Antony, Hannah, Ryan, Jody
+
+[ ] DateFormatter and Locator @Jody K 
+  Do we want to update the default locator and ticks or just provide another Formatter option for savvy users? 
+  - https://github.com/matplotlib/matplotlib/pull/10841
+  - https://github.com/matplotlib/matplotlib/pull/9801
+[ ] Google summer of code student
+  - project?
+[ ] Extra Ticks: 
+  why do we need extra ticks around viewlims?  These end up causing headaches because they are not drawn, and their visible state is true (in master).  
+  - https://github.com/matplotlib/matplotlib/pull/10881
+  - https://github.com/matplotlib/matplotlib/issues/10874
+  - https://github.com/matplotlib/matplotlib/pull/9452
+  - https://github.com/matplotlib/matplotlib/issues/9397
+
+## Notes
+
+### Ticks
+
+  - issues with extra ticks outside viewlims.  Antony said they were due to roundoff errors.
+  - maybe trim at Locator level. 
+  - deprecate not visible:  
+    - `ticker.Locator` would all need to change
+    - deprecate out of range ticks first, and then expect proper list
+    - epsilon out of viewlims?  Keep those.  
+  - ticks and lines top and bottom: individual lines for each ticks.  
+    - overhaul, single line for top and bottom ticks.  `LineCollection` for grids.
+    - back compatibility?  Custom `Axes` subclass with new `Axis` subclass….
+    - each line call is slow (units support).
+    - speed benefit? 
+    - can’t manipulate individual tick visibility.  
+
+### Datetime formatting:
+
+  - https://github.com/matplotlib/matplotlib/pull/10841
+  - https://github.com/matplotlib/matplotlib/pull/9801
+  - General agreement locator
+  - General agreement formatter:
+    - needs way to get old beghaviour
+    - useful for teaching/default
+  - @Antony L suggested naming convention
+    - MPLxyDateFormatter
+    - Alias AutoFormatter to current MPLXYDateFormatter
+    - Document “We reserve right to change formatter”
+  - deprecate old linear scalar formatter? 
+  - localization of month
+    - Check if way?
+
+### To merge:
+
+[x] https://github.com/matplotlib/matplotlib/pull/10314
+[x] https://github.com/matplotlib/matplotlib/pull/10158