61: MiniTess

Explore ...
62: explore Tess
63: test tess
64: song ho's Tess examples
65: refactor
66: change some array to local vars
70: change some arr to local vars 2
71
Merge branch 'v_tess' into v_mini01
72: explore agg core
74: focus on RGBA color actor

choose appropriate ctor at compile time
80: refactor
81
82:  NativeBufferMan
83: rearrange
84: arrange code ...
85: errors
86: errs
95: fix StackBlur v1

need performance improvement
96: ImageBufferHelper

move some code from ImageBuffer to ImageBufferHelper