change build dir to 'bin'
Fixed circumference typo
Changed Circumference caching to use arrays
small changes
Moved to explicit midpoint circle algorithm in hough filter
use local var
switched to 1D houghspace structure
changed shortimagebuffer to 1D array
inlined BYTE constant
optimised operation count
Reduced multiplications
Reduced operation count further
optimised circle picker
only use an inner average score if radius is odd
Tweaked fonts and weightings