Change command line compiler directive priority

[dagss]

Currently a directive is set by these precedence rules (i.e. start at the top of the list and continue until a setting is found):

1) with statement and decorators w/ block level 2) command line switch --directive 3) #cython comment at top of file 4) builtin defaults

Now that we see what kind of things this can be used for (i.e. cdivision), I propose that the 2) and 3) are exchanged, so that #cython comments take precedence before command line.

[dagss]

Simple change, but should be done.

[dagss]

Done.