JOHANNESBURG, Dec 31 (Reuters) - South Africa has declared an amnesty on illegal guns in its latest drive to tackle the high level of violent crime, the South African Press Association reported on Friday. The three-month amnesty, due to start in October but delayed to allow more planning, will run from Jan. 1 to March 31. People may hand in unlicensed guns free from prosecution unless the gun is found to have been used to commit a crime, SAPA quoted a security ministry statement as saying. Since democratic elections in 1994 marked the end of apartheid, the high level of...