SciTools/iris — pull request #1117 by pp-mo (2014-05-06 18:18:57+00:00)
Title: Ffl withlists

I don't seriously expect you to incorporate this.
But check this out, with the following speed compare :
```
itpp@eld238: /net/home/h05/itpp/git/iris/iris_main > ../../tehuti/tehuti.py fastpp ffl_withlists wl_fast_field_loading
Loading cache from /home/h05/itpp/.local/share/tehuti/fastpp.json
timeit-fast_load_pp
2.63138508797 -> 7.60107111931 (289%)
```

But **WARNING** lots of tests now get slightly different floating-point values, which messes up a lot of stuff...
E.G.
```
======================================================================
FAIL: test_full_file (iris.tests.test_pp_module.TestPPField_GlobalTemperature)
----------------------------------------------------------------------
Traceback (most recent call last):
File "/home/h05/itpp/git/iris/iris_main/lib/iris/tests/test_pp_module.py", line 164, in test_full_file
self.check_pp(self.r[0:10], ('PP', 'global_test.pp.txt'))
File "/home/h05/itpp/git/iris/iris_main/lib/iris/tests/test_pp_module.py", line 89, in check_pp
self._assert_str_same(reference+'\n', test_string+'\n', reference_filename, type_comparison_name='PP files')
File "/home/h05/itpp/git/iris/iris_main/lib/iris/tests/__init__.py", line 161, in _assert_str_same
self.fail("%s do not match: %s\n%s" % (type_comparison_name, reference_filename, diff))
AssertionError: PP files do not match: ('PP', 'global_test.pp.txt')
--- Reference
+++ Test result
@@ -48,5 +48,5 @@
- bzy: 92.5
- bdy: -2.5
- bzx: -3.75
- bdx: 3.75
- bmdi: -1e+30
+ bzy: 92.4999847412
+ bdy: -2.49999904633
+ bzx: -3.74999904633
+ bdx: 3.74999904633
+ bmdi: -1.00000001505e+30
```