* Remove duplicate developer credits added in last commit.
* Update developer email addresses.
* Change copyright.h from GPL2+ to GPL3+ per FSF.
* Update newstroke license from CC-BY to CC0 with permission by author
Vladimir Uryvaev which reflects the official license on the newstroke
website http://vovanium.ru/sledy/newstroke/en.
* Coding policy fixes in AboutDialog_main.cpp.
Eeschema: cleaning code. Start work to enhance annotation algorithm.
Already added an option to annotate using sheet number (sheet 1 uses numbers 100 to 199, sheet 2 uses 200 to 299..).
Works fine if deleting existing annotation, but needs work to be used when the existing annotation is kept .