def kzh_5_slope_q22_f2_1()
Add a new 6-slope extreme function kzh_6_slope_fulldim_covers_4(),
found by search_kslope_example(6, 27, 5, mode='heuristic')
Add a new 6-slope extreme function kzh_6_slope_fulldim_covers_5(),
found by search_kslope_example(6, 27, 7, mode='heuristic')
find_f: Use 'is None'
Get rid of most @cached_function, instead explicitly cache results in the function
Merge branch 'no_cached_function'

Conflicts:
	functions.sage
Add kzh_7_slope_1() and kzh_7_slope_2()
Merge remote-tracking branch 'yuan-dropbox/master'