Summon

- added NCBI example
- bug fixes for mac os x
- bug fixes
- fixed text_clip issue for freeglut 2.6.0
- fixed bmp screenshot

- refactored API
- added more examples
- bug fixes

- speed and memory improvements
- smaller faster Element data structure
- simpler thread management
- more reliable timer wait times (frame rates)
- Mac OS X bug fix for opening initial window

- better windows install
- added direct bitmap screenshot
- added first version of visualization inspector
- better behavior of text_clipS inside transforms by implementing them with
zoom_clampS
- preliminary support for dragging

- bug fixes
- summatrix toggle label bug fix
- proper implementation of replace_group()
- cleaned up timer interface
- added summon.shapes.message_bubble

- changed default keybinding to be more sensible
- left click is hotspot activate
- left drag is scroll/translate
- middle click is popup menu
- fixed freeze in KDE and other window managers with restrictions on min window
size. Bug introduced in 1.8.2
- added hierarchy layout to sumtree; useful for clustering visualization
- added zoom_clamp() drawing element
- added Window.set_boundary(). Limits viewable area.
- added hotspot_custom(), hotspot_circle(), hotspot_polygon()
- added more features to Window.set_visible()
- added OverviewWindow
- added row and column trees to summatrix
- added popup menus to summatrix and sumtree
- changed antialiasing behavior