non-integer bit diameters cause a crash

[nathanielstenzel]

A non-integer bit diameters cause a crash. See below.

DONE WITH RENDER
Traceback (most recent call last):
File "bucket_mill.py", line 988, in
bottom = where(filter_grid(bottom,min_value=(min_stl_zstl_detail),input_filter='nearby',size=(2+2bit_diameter)*stl_detail), bottom, do_not_cut)
File "bucket_mill.py", line 729, in filter_grid
mask = ones((size,size))
File "/usr/lib64/python2.7/site-packages/numpy/core/numeric.py", line 192, in ones
a = empty(shape, dtype, order)
TypeError: 'float' object cannot be interpreted as an index

[nathanielstenzel]

This is at least partially fixed now, but I am not sure if it is fixed in a proper way. There were a few spots of code where I tell it to just use the integer version of the bit diameter. This needs more testing.

[nathanielstenzel]

A final cut test showed movement at the max Y border when using a non-integer bit diameter. That movement looks like it is above Z=0. This should not be a problem unless the clamp is there.