maint: add configurations of flake8 and pytest to setup.cfg

Author: oesteban

setup.cfg

@@ -94,8 +94,8 @@ parentdir_prefix =
 
 [flake8]
 max-line-length = 99
-doctests = True
-exclude=*build/,*/_afq/*
+doctests = False
+exclude=*build/,*/.afq/*
 select = C,E,F,W,B,B950
 ignore = N802,N806,W504,E203
 putty-ignore =
@@ -105,4 +105,9 @@ putty-ignore =
 
 [tool:pytest]
 norecursedirs = .* _*
-addopts = --doctest-modules
+addopts = -vx --doctest-modules
+doctest_optionflags = ALLOW_UNICODE NORMALIZE_WHITESPACE
+env =
+    PYTHONHASHSEED=0
+filterwarnings =
+    ignore::DeprecationWarning