Brought HISTORY.md and MANUAL.md up to date

Updated MANUAL.md, HISTORY.md, and version constants for a new release.

Update version constants and file dates in curses.h and HISTORY.md

Updated version constants and HISTORY.md for v4.3.5

Time for a version update. I expect there will be another one quite s…

…oon, to include clangen's single-threaded WinGUI changes, but thought it'd be good to have a 'changes to date' (there have been many) version followed by a 'single-threaded WinGUI' version.

Version change from 4.3.2 to 4.3.3.

Update version number and day in 'curses.h' and 'HISTORY.md' to refle…

…ct new 4.3.2 version

Updated versioning for endwin() to 4.3.2. Should have been part of pr…

…evious commit...

Brought HISTORY.md up to date

Final updates (HISTORY.md, version constants in curses.h) for 4.3.0.