Added a new portable sleep API(ABI compatible). Now features a flexible multi-usage sleep() api accepting decimals, msleep() for millisecs only, usleep() for microsecs. Updated Makefiles, cmakefiles, vs2008, vs2010 with the new Fl_sleep add-on. Documented new API. still needs to be added in Xcode.

git-svn-id: http://seriss.com/public/fltk/fltk/branches/branch-1.3@10150 ea41ed52-d2ee-0310-a9c1-e6b18d33e121
Updated XCode 3+4 project files with new Fl_sleep.cxx file.

git-svn-id: http://seriss.com/public/fltk/fltk/branches/branch-1.3@10151 ea41ed52-d2ee-0310-a9c1-e6b18d33e121
Implements STR #2621: Add line numbers to Fl_Text_Display.
Applied LZA's patch and included some mods to address TODO items and ABI issues.

Also update CREDITS with LZA and a few other notably absent names.



git-svn-id: http://seriss.com/public/fltk/fltk/branches/branch-1.3@10152 ea41ed52-d2ee-0310-a9c1-e6b18d33e121
Adding editor screenshot with line# feature enabled.


git-svn-id: http://seriss.com/public/fltk/fltk/branches/branch-1.3@10153 ea41ed52-d2ee-0310-a9c1-e6b18d33e121